Vegetable Biryani

What is the difference between biryani and pulao?

Method, not ingredients. A biryani cooks its rice and its masala separately and then marries them under sealed steam, so the finished dish has distinct strata and grains that taste different depending on where they sat. A pulao cooks everything together in measured water, absorbed by the rice, so the flavour is uniform throughout. A one-pot dish described as biryani is almost always a pulao. Neither is superior, but they are not interchangeable.

Why is the rice only part cooked?

Because it finishes in the pot. Rice boiled to seventy per cent still has a firm core, and the twenty minutes of trapped steam during dum cooks that core through while the grain absorbs aroma from the layer beneath. Rice boiled fully before layering has nowhere to go but to mush. The test is physical rather than timed: lift a grain, press it between finger and thumb, and stop the moment it flattens with a visible white centre.

What does dum actually do?

It traps steam and forces it to travel through the layers rather than escaping. Sealing the pot, traditionally with a rope of dough around the lid, means the moisture from the vegetables and curd rises through the rice, carrying aromatic compounds from the whole spices, saffron and mint. That vertical movement is why a properly made biryani smells different at the top and bottom of the pot. An unsealed lid lets that steam go and produces seasoned rice sitting on vegetables.

How do you stop the bottom from burning?

Put a tawa under the pot and keep the flame at its lowest. Direct contact between a thin pot base and a gas ring gives you a scorched layer within ten minutes, because there is very little liquid at the bottom by design. The tawa diffuses the heat. A heavy-bottomed pot helps as well, and some cooks line the base with a few onion slices as insurance.

Which vegetables work and which do not?

Carrot, beans, cauliflower, potato and peas all hold their shape through the second cooking. Courgette, marrow and aubergine release too much water and turn the layer soupy, which then makes the rice above it wet. Cauliflower should go in slightly undercooked, since it softens fast under dum. If you want more substance, fried paneer or soaked soya chunks added with the vegetables raise the protein considerably without altering the technique.

Is vegetable biryani a balanced meal?

On its own, not quite. It is largely rice, and although the vegetables add fibre and micronutrients, the protein is low unless you have added paneer, soya or a good quantity of curd. The traditional accompaniment solves this: a bowl of raita supplies dairy protein and the acidity that cuts the ghee. Serve it with raita and a salad and the plate balances. Serve it alone and it is a carbohydrate meal.

Can it be made ahead?

The components, yes; the assembly, no. Fry the onions, prepare the vegetable masala and boil the rice up to a day ahead and refrigerate them separately. Layer and dum just before serving, which takes half an hour. A biryani that has been assembled, cooled and reheated loses the distinction between its layers, which is the thing you did all the work for.