Before You Start
If you want to see how much work chaat masala and lime can do, start here. Corn chaat takes boiled kernels, or kernels cut from a charred cob, and turns them into a snack with a few chopped vegetables, a squeeze of citrus and a spoonful of spice blend. There is no frying, no chutney to prepare and none of the multi-step assembly that other chaats need. Street vendors often keep big pressure cookers of boiled corn on their carts, and the same stalls may sell grilled corn on the cob (bhutta) rubbed with butter and spices.
With so little going on technically, the corn itself carries more weight here than in nearly any other recipe in this library. Fresh, in-season sweet corn barely needs help. Corn that has been sitting around is blander and starchier, so give it a heavier hand with lime and chaat masala to make up for it.
Where This Dish Comes From
Corn chaat does not come with the old and argued-over origin stories that pani puri or bhel puri have. It is a newer, practical street-food item that appeared as roadside chaat carts multiplied in Indian cities during the twentieth century, and it applies the familiar chaat masala and lime treatment to something cheap, filling and easy to find. It is sold all over the country without strong regional ties, unlike dishes bound to a particular city, though the exact vegetables and garnishes change from one vendor and household to the next.
Step by Step
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Prep
Get the corn ready
With fresh cobs, boil or steam them for about 8 to 10 minutes until the kernels are tender, let them cool a little and slice the kernels off the cob. Frozen kernels can go straight into boiling water for 3 to 4 minutes, until soft. If you like a smokier flavor, set whole cobs over a flame or on a hot grill and turn them now and then until they are lightly charred in places, then cut the kernels away.
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Prep
Mix in the chopped vegetables
Put the corn in a mixing bowl with the diced tomato, onion, cucumber if you are using it, green chilli and coriander.
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Assemble
Dress and toss
Pour in the lime juice and add the chaat masala, roasted cumin, chilli powder if you want it, and salt. Toss everything gently until the corn is evenly coated, then taste. The result should be bright and tangy from the lime, and the savory, sour notes of the chaat masala should come through clearly instead of hiding in the background.
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Serve
Add the topping and serve without waiting
Spoon the chaat into bowls or cups and, if you like, sprinkle sev on top for crunch. Serve it right away. Lime juice and salt keep drawing water out of the vegetables, so the longer it sits, the wetter the bowl gets.
Swaps That Work
You can vary or leave out the cucumber and tomato depending on what you have. Pomegranate seeds, boiled chickpeas and diced bell pepper are all common and perfectly good additions. If you do not have chaat masala, blend roasted cumin powder with a pinch of black salt and a little amchur for a decent approximation. A spoonful of finely chopped raw mango, used in place of some of the lime juice, gives a sharper sourness and is a popular variation in North India during mango season.
Turning the Heat Up or Down
The green chilli and the optional red chilli powder provide the heat, and each is easy to change independently. Leave out the green chilli altogether for a chaat that is tangy and savory with no real heat. Chaat masala is sour and savory instead of hot, so adding more of it deepens the flavor without pushing up the heat much.
Where Cooks Often Slip
Dressing the chaat too long before serving is the main mistake. Once the vegetables meet salt and lime, they give up water quickly, and a crisp, bright bowl can turn watery in 20 to 30 minutes. Under-seasoning is the second. Corn chaat needs a confident amount of chaat masala and lime, otherwise it tastes like plain boiled corn with vegetables stirred in. The third is overcooking the corn, particularly frozen kernels, which go mushy after just a couple of minutes in boiling water; they only need to heat through and lose their raw bite. And if you grill cobs for a smokier version, avoid charring them so hard that the kernels dry out. A light, patchy char adds flavor without costing juiciness.
Keeping and Warming Up Leftovers
To keep it: You can cook the corn and chop the vegetables a day ahead and keep them refrigerated in separate containers, but mix, dress and season them only shortly before eating. A dressed corn chaat does not keep well and is best eaten within 30 minutes to an hour. For a larger gathering, serve the dressing on the side and let guests combine their own portions. That protects the texture and lets each person choose how much lime and chaat masala to add.
To warm it up: This is a cold or room-temperature dish and is not meant to be reheated. If you boiled the corn earlier and chilled it, you can warm it briefly before mixing it with the other ingredients, but the finished chaat is served cold.
Kitchen Safety Note
Wash all fresh produce well before you chop it. If you boiled the corn ahead of time, cool it quickly and refrigerate it instead of leaving it out for a long stretch. Once it is mixed with lime juice and fresh vegetables, treat the chaat like any fresh salad: keep it in the refrigerator if you are not eating it right away, and discard it if it has been left at room temperature for more than about two hours.