Melt 100 grams of butter in a pot that you can put a close fitting lid on. Lightly saute a medium onion that is very finely diced.

Throw in 400 grams of rice (basmati or jasmine) and toss through the onions so that the rice becomes transparent looking - this will happen quite quickly.

Add 700ml of water and bring to the boil, then turn the heat down very very low and simmer for twenty minutes by which time the water will be totally absorbed and you will be left with buttery rice.