Mung Kavum (Mung Bean Oil Cake)
Also known as Moong Kavum
Mung kavum, also called mung bean oil cake or moong kavum, is a diamond-shaped Avurudu sweet. You knead roasted green gram (mung) flour with thick treacle or jaggery syrup into a stiff paste, cut it into small diamonds, dip each one in a thin rice-flour batter and deep-fry. The outside crisps and turns golden while the dense mung centre stays soft and fudgy. It's a prized, more delicate cousin of the familiar rice-flour kavum, and one of the proudest sweets you can set out for the Sinhala and Tamil New Year.
Think of mung kavum as the rice-flour oil cake's more delicate cousin: little battered diamonds of treacle-sweet roasted mung, crisp outside and densely fudgy within, made for the New Year table.
- Total time
- 65 min
- 40 min prep · 25 min cook
- Serves
- 16 people
- Difficulty
- Advanced
- Spice level
- Mild
- Country help
- USA · UK · AU · CA substitutes included
CeylonCooking
ceyloncooking.com/recipes/mung-kavum
Mung Kavum
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Nutrition
Estimated values, per serving.
About This Dish
Mung kavum is the kind of sweet that earns a quiet murmur when it lands on the New Year table. The name pretty much tells you what's going on: mung is green gram, kavum is oil cake, so this is an oil cake built on roasted mung flour instead of the rice flour in everyday kavum. You'll also see it written as mung bean oil cake or moong kavum. Call it what you like, it's a small battered diamond with a crisp golden shell and a dense, treacle-dark centre that tastes deeply of toasted pulse and palm sweetness.
Mung kavum is a celebration sweet, full stop. Avurudu, the Sinhala and Tamil New Year, is the season of the kavili tray, that spread of oil-fried and griddle sweets every household lays out for visitors, and mung kavum sits among the most respected of them. Plain rice-flour kavum is the workhorse of the tray, made in big batches with its little peak pointing up. Mung kavum is the one cooks reach for when they want to show off a steadier hand, because the roasted-mung paste is fussier to get right and the diamonds have to be battered and fried just so. A plate of them signals care and a generous house.
What makes a good mung kavum is the contrast hiding inside it. Bite through the thin, crackly batter shell and you hit a soft, almost fudgy interior, sweet with treacle and nutty from the roasted green gram, holding its shape but yielding straight away. The whole thing should be small and neat, a tidy diamond rather than a clumsy lump, and never greasy. Get the treacle paste too wet and the diamonds slump in the oil; too dry and they crumble. The cooks who are good at it make it look easy, and that's exactly why it's prized.
Mung has long carried the idea of nourishment and good fortune in the island's kitchen, steamed plain for the New Year, ground into sweets, simmered into porridge. Fold it into a kavum and that humble, auspicious pulse joins one of the oldest festive forms there is, the deep-fried oil cake, turning a handful of green gram into something special enough for the most important table of the year.
Roasted Mung Flour, Treacle Paste, and Why the Diamonds Are Battered
The soul of this sweet is roasted mung (green gram) flour. Whole green gram gets dry-roasted in a pan until it turns a shade darker and smells deeply nutty and toasty, then ground fine to a pale golden flour. That roasting is not optional. Raw mung flour tastes flat and beany, while roasted mung flour is fragrant, sweet-edged and the very thing that makes mung kavum taste of mung rather than just of sugar. It also gives the centre its dense, fudgy body once the syrup goes in.
The flour is bound not with water but with a thick treacle or jaggery syrup, cooked down until it's heavy and sticky, almost at the soft-ball stage. Knead that into the roasted flour and you get a stiff, pliable paste, dark and glossy, that rolls flat and cuts into diamonds that hold their edges. The treacle does double duty: it sweetens and it binds, and how far you reduce it decides whether the paste is workably stiff or hopelessly soft.
Then the diamonds are dipped in a thin rice-flour batter before they hit the oil, and this is the step that catches people out. The treacle paste on its own would soften, spread and even dissolve at the edges in hot oil, losing its neat diamond shape. The batter is a protective jacket: it sets instantly into a crisp, golden shell that seals the soft mung centre inside, keeps the diamond sharp, and gives mung kavum its signature crackle against the fudgy middle. No batter, no proper kavum.
What It Should Taste Like
You get a thin, crisp, golden shell giving way to a dense, soft, fudgy centre that is deeply nutty from roasted green gram and richly sweet from dark treacle. Small and neat, never greasy, with the toasted-mung flavour leading and the palm sweetness rounding it off.
Ingredients
This recipe makes 16 servings. Change the number and every amount below updates with it. Substitutes for hard-to-find items are in the sidebar.
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For the Roasted Mung Flour
- Whole mung beans (green gram)to roast and grind, or use ready roasted mung flour2 cups
For the Treacle Paste
- Kithul treacle or jaggerytreacle as is, or jaggery grated and melted1¼ cups
- Wateronly if using jaggery, to start it melting2-3 tbsp
- Cardamomground, optional¼ tsp
- Salta pinch
For the Batter and Frying
- Rice flour¾ cup
- Waterto make a thin, smooth batterabout ½ cup
- Salta pinch
- Oila neutral oil or coconut oilfor deep-frying
Method
Follow these 8 steps. Each one explains not just what to do, but why it matters.
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- 01
Roast the Mung Beans
Dry-roast the whole mung beans in a heavy pan over medium-low heat, stirring constantly, until they darken a shade and smell deeply nutty and toasted, about 8-10 minutes. Then tip them out to cool.
This is where the whole flavour of mung kavum is born, so don't rush it or walk away. As the beans heat they go from raw and grassy-smelling to fragrant and toasty, and you'll hear the odd one crackle and see them turn from bright green to a deeper, duller shade with the occasional toasted spot. That colour and aroma are your cue. Stir the whole time so they roast evenly and none scorch, because a few burnt beans will throw a bitter note right through the finished sweet.
Tip: Roast in two batches rather than crowding the pan. A thin, even layer toasts far more evenly than a deep heap that steams in the middle.
- 02
Grind to a Fine Flour
Once the roasted beans are fully cool, grind them to a fine flour in a dry grinder or mill, then sift it. Regrind any coarse bits left in the sieve.
The finer the flour, the smoother and more fudgy your finished centre will be, so really do sift. Warm beans turn gummy and clog the grinder, which is why they must be properly cool first. After grinding you want a soft, pale-golden powder that feels silky between your fingers, with no gritty fragments; any coarse pieces left in the sieve should go back through the grinder rather than into the paste, where they would make the diamonds crumbly.
Tip: Short of time or equipment? Ready roasted mung flour, sold for exactly this kind of sweet, skips the roasting and grinding altogether and works perfectly here.
- 03
Cook the Treacle to a Thick Syrup
Warm the treacle (or melt the grated jaggery with a splash of water) in a pan over low heat with the cardamom and salt, and let it cook down until it is thick, heavy and sticky, nearly at the soft-ball stage.
The syrup is the binder, and how far you reduce it decides everything that follows. Cook it gently until it thickens, goes glossy and slow-moving, coats the back of the spoon, and falls in heavy ribbons. Drop a little into cold water. It should form a soft, pliable ball, not dissolve away. Too thin and the paste will never stiffen enough to cut. Too far and it sets hard, so the kavum turns brittle. Keep the heat low so it doesn't scorch and turn bitter.
Tip: If you're unsure, stop a touch early. You can always cook the syrup a little more, but you can't un-reduce a syrup that has gone too hard.
- 04
Knead into a Stiff Paste
Pour the hot syrup over the roasted mung flour a little at a time. Mix with a spoon, then once it's cool enough to handle, knead by hand until you have a stiff, smooth, dark paste that holds together.
Add the syrup gradually, because how much the flour drinks up varies with how finely it was ground and how far the treacle reduced. You're looking for a paste that's firm and pliable, like a stiff dough: dark, glossy, holding its shape without sticking wetly to your hands or crumbling apart. Knead it well so it becomes smooth and even. That's what gives the centre its dense, fudgy body. Work fairly quickly while it's still warm and supple, because it stiffens as it cools.
Tip: Test it by pressing a small piece flat. If the edges crack and fall apart, it's too dry, so work in a little more warm syrup. If it slumps and sticks, dust in a little more roasted flour.
- 05
Roll Out and Cut Diamonds
Roll or press the paste out to an even slab about 1 cm thick on a lightly greased surface. Cut it into small diamonds with a knife.
Keep the slab even. Thin spots will crisp through to the centre, thick ones stay raw and heavy. To cut diamonds, score parallel lines one way, then cut across them on the diagonal, and you get neat little rhombuses. Small is better here. A small diamond fries through evenly and keeps the crisp shell and soft centre in balance, while an oversized one tends to stay doughy in the middle. Aim for tidy, similar-sized pieces so they cook at the same rate.
Tip: Lightly grease your hands, the surface and the knife with a little oil. The treacle paste is sticky, and a thin film of oil keeps it from dragging and tearing.
- 06
Make the Rice-Flour Batter
Whisk the rice flour with a pinch of salt and enough water to make a thin, smooth, pourable batter, about the consistency of single cream.
This batter is the protective shell, so its consistency is everything. It should be thin enough to leave only a light, even film on each diamond, not a thick gluey coat. Too thick and you get a heavy doughy crust. Too thin and it won't seal the treacle centre at all. Whisk out any lumps so the coating fries smooth and crisp. It should cling to a diamond in a thin sheet and drip off in a steady thread, not cling in clumps.
Tip: Make the batter just before frying and give it a stir between batches. Rice flour settles to the bottom and the batter thickens as it stands.
- 07
Batter and Deep-Fry the Diamonds
Heat the oil to medium. Dip each diamond in the batter to coat it all over, let the excess drip off, and slide it into the oil. Fry a few at a time until the shell is crisp and golden, turning so they colour evenly.
Here's the thing. The batter is what saves the shape. Dip each diamond and slip it into properly hot oil, and the coating sets at once into a crisp jacket that seals the soft mung paste inside. It browns and crackles instead of slumping or dissolving. The oil should be medium-hot. Too cool and the batter soaks up grease and goes soggy while the centre softens too far. Too hot and the shell burns before it sets. Fry only a few at a time so the oil stays hot and the diamonds do not stick together. They are done when the coating is evenly golden and crisp.
Tip: Test the oil with a drop of batter first. It should rise and sizzle steadily within a couple of seconds. Not sink and sit, not brown instantly.
- 08
Drain and Cool
Lift the fried diamonds out with a slotted spoon and drain them on a rack or paper. Let them cool completely before serving or storing.
Draining well is what keeps mung kavum crisp, not greasy. Lift each one clear of the oil and let it sit so the surface oil runs off. As they cool, the shell firms to a proper crackle and the centre settles into that dense, fudgy texture. A warm-from-the-oil diamond will feel softer than the finished sweet. Let them cool fully before stacking or boxing, or trapped steam will soften the crisp shell you worked for.
Tip: A wire rack drains far better than a flat plate of paper. Paper can leave the underside sitting in its own oil and going soft.
Common Mistakes to Avoid
- Skipping or skimping the roasting of the mung, so the centre tastes flat and beany instead of deeply nutty.
- Getting the treacle syrup wrong: too thin and the paste won't stiffen to cut, too far reduced and the kavum turns hard and brittle.
- Not battering the diamonds, so the treacle paste slumps, spreads or dissolves at the edges in the hot oil and loses its shape.
- Making a batter that is too thick, so it fries into a heavy, doughy crust instead of a thin, crisp shell.
- Frying in oil that is too cool, so the diamonds drink up grease and turn soggy, or too hot, so the shell burns before the centre sets.
- Cutting the diamonds too large, which leaves the dense centre raw and heavy while the outside over-browns.
- Stacking or boxing them while still warm, which traps steam and softens the crisp shell.
Serving Ideas
- On the Avurudu kavili tray alongside kokis, kavum and aluwa for the New Year spread.
- With a cup of strong Ceylon tea. The bitterness cuts the treacle sweetness.
- Offered to visitors during the New Year season, a few neat diamonds to a plate.
- As a sweet finish to a festive rice and curry meal.
- Boxed up as a homemade gift of New Year sweets for family and neighbours.
Building a whole plate around it? Start from our sri lankan party menu menu, which sets out what to cook alongside it and in what order.
Storage and Make-Ahead
Mung kavum keeps for about a week in an airtight tin or container at room temperature once fully cooled. That's why it's made ahead for the New Year. Keep the tin well sealed so the crisp shell doesn't soften in humid air, and store it away from anything strongly scented. Don't refrigerate it. The fridge turns the shell soft and chewy. If they lose their crispness, a few minutes in a low oven can revive the shell.
Two Ways to Cook It
Use ready roasted mung flour to skip the roasting and grinding, and use treacle straight from the bottle so you only have to reduce it a little. Cut the diamonds on the small side so they fry through easily, keep the batter thin, and fry just a few at a time over steady medium heat so the temperature is easy to manage.
Roast and grind your own whole mung beans for the freshest, most fragrant flour, bind it with thick kithul treacle cooked down to the soft-ball stage, and fry the battered diamonds in coconut oil for the New Year tray. Work the paste while warm, cut neat small diamonds by hand, and aim for a crisp shell over a dense, fudgy centre.
Lighter and Healthier Version
Mung kavum is a deep-fried festive sweet, so it will never be a light food, but it is naturally plant-based and built on roasted green gram, which carries real protein and fibre. A few small changes ease back on the heaviest elements without losing the crisp-shelled, fudgy-centred character that makes it kavum.
Keep Them Small
Cut the diamonds small. A small kavum satisfies the same craving for a fraction of the oil and sugar of a large one, and it fries through more evenly too.
Drain Thoroughly
Fry in properly hot oil and drain each diamond on a wire rack rather than a flat plate, so far less oil clings to the crisp shell.
Ease off the Treacle
Reduce the treacle a little. The roasted mung brings plenty of flavour of its own, so the paste stays rich and dark with slightly less sweetness.
Lean on the Mung
Because the centre is roasted green gram, each kavum carries a little plant protein and fibre that plain rice-flour kavum does not, so a small one is a more sustaining treat than its sugar alone would suggest.
Frequently Asked Questions
Mung kavum is a Sri Lankan festive sweet, a diamond-shaped oil cake made from roasted green gram (mung) flour kneaded with thick treacle or jaggery into a stiff paste, then cut into small diamonds, dipped in a thin rice-flour batter and deep-fried. The shell turns crisp and golden while the mung centre stays dense and fudgy. It is a prized item on the Avurudu (Sinhala and Tamil New Year) sweet tray.
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