Step 1

Preheat oven to 180°C/350°F. Grease a deep 20cm (8-inch) square cake pan; line base and sides with baking paper.

Step 2

Beat butter, extract and sugar in a medium bowl with an electric mixer until light and fluffy. Beat in eggs, one at a time. Stir in sifted flours and milk, in two batches. Spread mixture into pan; smooth surface.

Step 3

Bake cake for 1 hour. Leave cake in pan for 5 minutes before turning, top-side up, onto a wire rack to cool. Dust with sifted icing sugar before serving.