Rice toasted in oil with onion, garlic and carrot, then cooked in broth. Two cups of rice to four of liquid, half an hour, and the toasting is what keeps the grains separate.
Two cups of rice to four of liquid is the ratio, and it is the one thing not to improvise with. Toasting the rice in oil before the liquid arrives is worth the three or four minutes it takes. Each grain gets a coat of fat, which keeps them separate instead of letting them clump, and the brief toasting adds a flavour you cannot get any other way. The Spanish verb for it is nacarar, to pearl, because the grain goes from chalky to translucent as it happens. Cover it when the liquid falls to the level of the rice, not when the pot is dry. Waiting for a dry pot means the bottom layer has already started to stick. Craters appearing on the surface are the signal. Then fifteen minutes with the lid on and no peeking: the trapped steam is what cooks the top of the rice.