Bring 3 litres of water to a vigorous boil in a large, heavy-bottomed pot.
Add 1000 g basmati rice and 5.8 g salt, give the pot a good stir, then cover with a lid and boil for 12 to 15 minutes until the grains are nearly tender but retain a firm bite at the centre.
Drain the rice through a fine colander or sieve, then tip the grains back into the pot.
Splash 125 ml of water over the rice, stir briefly to loosen the grains, and drain thoroughly a second time.
Transfer the rice back into the pot, wrap a clean tea towel securely around and underneath the lid to trap condensation, and set the lid firmly in place.
Set the pot over a hotplate or griddle over low heat—or place directly over the lowest flame—and let the rice steam undisturbed for about 30 minutes until fully tender.