3 1/2 oz butter
4 heaped desert spoons cocoa
Remove from heat and stir in:
8 oz granulated sugar
3 oz self raising flour
Line tin approx 8" square with greaseproof.
Pour in & bake @ 180 c for 25 minutes
(usually doesn't need 2 cook quite as long and usually better to use a slightly smaller tin because then it's not so thin!)