Melt the butter or margarine, then stir
in the granulated sugar. Stir in the flour and cocoa. Press into a
lined 18 x 28 cm/7 x 11 in baking tin (pan). Bake in a preheated oven
at 180°C/ 350°F/gas mark 4 for about 20 minutes until springy to the
To make the icing, sift the icing sugar and cocoa into a bowl and add
a drop of boiling water. Stir until well blended, adding a drop or so
more water if necessary. Ice the brownies while still warm (but not
hot), then leave to cool before cutting into squares.