Before You Start
If your onion fritters have ever come out like round, doughy dumplings with a bit of onion hidden inside, kanda bhaji is the cure. Here the onion is the main event and the batter is only the glue. You slice the onions thin, salt them so they give up their own moisture, and then add just enough gram flour to cling to the strands. Nothing gets poured or drowned.
What you get is a loose, tangled fritter with lots of rough edges, and every edge turns crisp in the oil. Underneath the crunch the onion goes soft and faintly sweet, and the spices sit quietly around it instead of shouting.
In Maharashtra, this is what people reach for when the rain sets in. A plate of kanda bhaji and a hot glass of chai is a familiar scene in Mumbai and Pune homes and at roadside stalls through the wet months. Across the rest of the country you will meet the same idea as onion pakora or pyaz pakora, usually with a thicker batter and a rounder shape. The Maharashtrian style stands apart because it uses so little batter and does not mind looking untidy.
Where This Dish Comes From
Frying vegetables in besan batter is an old habit across the subcontinent, and nobody can fairly say one region invented it; versions turn up everywhere from Punjab down to Tamil Nadu. What belongs more specifically to Maharashtra is the name kanda bhaji and the style that goes with it: very thin onion, barely any batter, a ragged outline, and a strong link to the monsoon rather than to fried snacks in general. Stalls in Mumbai and Pune that sell little else while the rains last are a truly regional sight, and they differ from the North Indian pakora vendors, who usually offer a wider mixed tray. Writers on Maharashtrian street food tend to describe kanda bhaji as a local specialty inside a much older, India-wide fritter tradition, not as a dish with one traceable moment of invention. That is the cautious reading, and it fits how long besan frying has been recorded in Indian regional cooking.
Step by Step
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Prep
Slice thin, then salt the onions and wait
Cut the onions in half and slice them as finely and evenly as your knife allows. Pull the layers apart with your fingers so you end up with loose strands, not clumps of stuck half-rings. Sprinkle over a pinch of salt and leave the bowl alone for 10 minutes. The salt pulls liquid out of the onion, and that liquid is going to do most of the work of wetting the besan, which is exactly why you will need so little water later.
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Prep
Mix the coating right in the onion bowl
Tip the besan, rice flour, chilli powder, turmeric, ajwain, coriander, green chillies, ginger and the rest of the salt directly over the salted onions. Use your hand to toss and squeeze gently. Resist the urge to whisk a separate batter and pour it on, because that gives you far too much coating. Working it into the onions lets their own juice bind everything and keeps the layer thin.
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Prep
Hold back the water unless it is truly dry
After a minute or two of mixing, the flour should turn into a thick, sticky paste that clings to the onions and does not pour. If the bowl still looks dusty and crumbly, sprinkle in water a teaspoon at a time. Many batches need none. If you overshoot and the mix turns runny, the fritters will fry up flat, heavy and greasy, not ragged and light, so add more besan rather than carrying on.
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Cook
Bring the oil to medium-high heat
Warm the oil in a kadhai to about 170 to 180°C (340 to 355°F). If you have no thermometer, drop in a pinch of the mixture. It should sink for a moment, then float up and bubble steadily within a couple of seconds. Oil that is cooler than this lets the fritters soak up grease, and they come out limp.
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Cook
Drop in loose, untidy clusters
Take a small fistful of the mixture and lower it into the oil without squeezing it into a ball. Those gaps and straggly ends are where the crunch comes from. Fry 5 to 6 pieces at a time and give them room to drift. If the pot gets crowded, the oil temperature falls and you end up with pale, unevenly cooked pakoras.
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Cook
Fry until deep gold and crackling
Give each batch 3 to 4 minutes, turning now and then, until the clusters are a rich golden brown and the thinnest edges have darkened slightly. When you tap one with the slotted spoon it should sound crackly. A pakora that looks cooked but still pale will go soft almost as soon as it leaves the pot, so let it take a little more colour.
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Cook
Rest them on a rack
Lift the pakoras out and set them on a wire rack. A plate or a pile of paper towels traps steam underneath and softens the bottom layer within moments. Wait for the oil to climb back to temperature before you lower in the next handful.
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Serve
Eat them while they still crackle
The first 10 minutes after frying is when kanda bhaji is at its best, with the outside still audibly crisp. Bring it to the table hot with green chutney, a squeeze of lime and a cup of tea, the classic partner. Do not park the whole batch under a lid or a cloth to keep it warm, because the trapped steam will soften every piece.
Swaps That Work
When hand-slicing the onions gets tiresome, run them over a mandoline set to its thinnest blade, which gives an even finer, more delicate fritter. You can replace one tablespoon of the rice flour with cornflour for a slightly different crunch that still holds up. For variety, mix in spinach leaves, thin potato slices or sliced green chillies in roughly the same quantity, though a plain onion version is the classic Maharashtrian one.
Turning the Heat Up or Down
Two things bring the heat here, the red chilli powder and the fresh green chillies, and you can turn each up or down on its own. For a gentler batch, leave out the fresh chilli, cut the chilli powder in half and let the ajwain and ginger carry the flavour. If you want more fire, add a chopped hot chilli such as bird's eye next to the regular one. A pinch of cayenne stirred in works better than piling on extra standard chilli powder, which tends to make the coating taste dull instead of sharp.
Where Cooks Often Slip
Too much water is the usual culprit. It turns a ragged, onion-heavy fritter into a flat, dense one, so give the onions' own juice a fair chance before you reach for the tap. Another frequent slip is frying in oil that has not recovered its heat, often because cold mixture went in right after the previous batch, and the result is greasy instead of crisp. Overfilling the pot does the same thing and also welds the pieces into one big lump. Last, onions sliced too thickly stay raw and sharp in the middle even when the outside looks well browned.
Keeping and Warming Up Leftovers
To keep it: Treat these as a cook-and-eat snack, because the texture that makes them good is gone within an hour, even at room temperature. If you have to keep some, let them cool completely, leave them uncovered until cold, and refrigerate for up to a day, knowing they will not crisp up quite the same way again. Do not mix the onion and besan ahead of time either. The salted onions keep releasing liquid, so the longer the mixture waits, the wetter it gets and the harder it becomes to fry well.
To warm it up: Spread leftover pakoras in a single layer and warm them in a hot oven or air fryer at about 190°C (375°F) for 5 to 6 minutes. Skip the microwave, which makes them rubbery and soft. They will not get back all of their just-fried crackle, but oven heat re-crisps the outside far better than any other method and makes them worth eating.
Kitchen Safety Note
Choose a pot deep enough that oil will not splash or foam over when the onions go in, since they carry some leftover water. Lower the coated handfuls in gently instead of dropping them from a height. Stay near hot oil at all times and keep the pot back from the stove edge where it could get bumped. If you want to reuse frying oil, strain out the bits after each use and throw it away once it turns dark, smells off or begins smoking at a lower temperature than it did when fresh. Old oil tastes worse and breaks down into compounds you would rather not eat. Always let used oil cool completely before you move or discard it.