Chocolate Brownie Cake

Ingredients: Makes one 38 x 25 cm / 15 x 10 in cake
100 g/4 oz butter or margarine
100 g/4 oz lard (shortening)
250 ml/8 fl oz/1 cup water25 g/1 oz cocoa (unsweetened chocolate) powder225g/8 oz/2 cups plain (all-purpose) flour450g/1 lb/2 cups caster (superfine) sugar120 ml/4 fl oz buttermilk
2 eggs, beaten5 ml/1 tsp bicarbonate of soda (baking soda)A pinch of salt5 ml/1 tsp vanilla essence (extract)
Method:
Melt the butter or margarine, lard, water and cocoa in a small pan. Mix the flour and sugar in a bowl, pour in the melted mixture and blend well. Stir in the remaining ingredients and beat until well blended. Spoon into a greased and floured Swiss roll tin (jelly roll pan) and bake in a preheated oven at 200°C/400°F/ gas mark 6 for 20 minutes until springy to the touch.