First, a word on this dish
You have a bowl of fruit that is perfectly nice and a little boring. Add a spoonful of chaat masala, a squeeze of lime and a pinch of black salt, and it turns into something people go back to for a second helping. That is fruit chaat. The black salt and dried mango powder inside the masala nudge the sugar toward savoury, the lime sharpens the whole bowl, and its acid also slows the browning of apple and banana while you carry everything to the table.
Carts sell it through the warm months, and plenty of homes make it on afternoons when nobody wants to stand near a stove. It involves no cooking at all, so success rests on just two things: using fruit that is properly ripe, and tasting as you season.
It also teaches you something about chaat masala. The same blend that makes boiled corn earthy and savoury makes fruit brighter and more interesting, without making it taste like a vegetable dish. Sugar and sour-salty spice pull in opposite directions without cancelling each other, and that pull is the whole attraction.
The story behind the dish
Fruit chaat is a practical, relatively modern street snack, without a long documented history of its own. What has an older history is chaat masala, which North Indian cooks used long before anyone sprinkled it on fruit. Vendors took what was ripe and cheap and gave it that seasoning. No city owns the dish. It is sold everywhere, and the fruit shifts with the calendar: pomegranate, banana and apple in winter, mango, watermelon and melon in summer. The seasoning stays put and the produce changes with the market, which helps explain why the snack has lasted.
The method, in order
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Prep
Chop the fruit at the last minute
Cut each fruit into pieces of similar size, so a spoonful holds a little of everything. Apple and banana discolour fastest, so cut them last, or turn them in a spoonful of lime juice right away to hold their colour.
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Assemble
Dress it gently
Tip the fruit into the bowl, add the lime juice, chaat masala and black salt, and the honey or sugar if you want it. Use a spoon to fold the fruit over and over. A heavy hand mashes banana and any other soft pieces.
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Prep
Taste a piece before serving
Pick up one piece and eat it. Very sweet fruit asks for more chaat masala and lime. Fruit on the tart side, like unripe mango, pomegranate or citrus, benefits from a little sweetener. Look for a balance of sweet, sour and salty, with none of the three shouting over the others.
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Serve
Finish with mint and bring to the table
Scatter torn mint over the top if you like it, and serve in bowls or cups right away, while the fruit is cold and still has a bit of crunch.
Ingredient stand-ins
Just about any fruit will do, so long as you consider how it holds up after cutting. Apple, pomegranate, grapes and orange segments keep their texture, while banana and very ripe mango turn soft fast, so add them just before eating. A pinch of roasted cumin powder with the chaat masala adds depth. Guava and half-ripe mango turn up in many regional versions because their firmness and sourness stand up to lime and spice, instead of vanishing the way soft, overripe fruit can.
Making it milder or fiercer
Classic fruit chaat is not hot. Chaat masala and black salt add tang and salt, not fire. If you want warmth, add a tiny pinch of red chilli powder or some finely chopped green chilli. More people are doing this now, but it does pull the bowl away from the cool, refreshing character that most expect.
The slip most cooks make
Dull, watery fruit chaat is generally the result of cutting too early. Apple and banana go soft and brown while they wait, and lime can only slow this, not stop it. Too much sugar is the second problem, since fruit is already sweet, and it turns a tangy snack into a dessert, so add sweetener in small amounts and keep tasting. Third, and easy to miss, is combining fruit at very different stages of ripeness. A soft ripe banana and a firm underripe guava cut the same size will not behave the same once dressed, with the banana breaking down while the guava stays crunchy. Put the softer fruit in last and fold lightly.
Storing what is left
Fridge or counter: Dress fruit chaat only when you are ready to eat, and finish the bowl within roughly an hour. For advance prep, cut the fruit without seasoning, keep it in the fridge for a few hours with some lime juice on it, and add chaat masala and more lime just before serving. Keep the bowl covered while it chills, because cut fruit picks up fridge smells quickly and softens faster when it sits uncovered.
Bringing it back to life: Fruit chaat is served cold and fresh, so nothing here gets reheated.
Handle with care
Wash all fruit before cutting, even fruit you plan to peel, because a knife can drag bacteria from the skin into the flesh. After dressing, keep the bowl in the fridge if it will not be eaten at once, and discard it if it has stood at room temperature for over about two hours, less in hot weather. Use a clean knife and board that have not touched raw meat, fish or onion. No cooking step follows to deal with cross-contamination.