Brown Betty

Grease sponge roll tin. Put icing sugar, brown sugar, golden syrup and butter in a large bowl. Add the milk and cream of tartar. Stir well. Micro-cook, uncovered, on high for 5 minutes, stirring once. Micro-cook on high for 4 minutes, stir once after 2 minutes. Stir in walnuts. Micro-cook, on high, for another 2 minutes. Beat for 2 minutes until thick. Pour into tin.

Source: Kid’s Microwave cookbook, page 72