Risotto, No. 2, made with Stock (Hot)

Chop half an onion very finely and fry it in ½ oz. of butter. Place 4 oz. of rice in a saucepan with ½ pint of stock, add the onion and cook until the stock is absorbed. Stir in 1 oz. of grated Parmesan cheese, pepper and salt to taste. Make very hot and serve.