Ingredients
Method
Make Lemon Filling (see below).
Preheat oven to 190°C. Grease a 26cm x 32cm Swiss roll pan; line base and two long sides with baking paper, extending paper 5cm over sides.
Beat butter, extract and sugar in a small bowl with an electric mixer until light and fluffy; transfer to a large bowl. Add ground almonds and sifted flour; mix well using clean hands.
Press two-thirds of the pastry evenly over base of pan. Wrap remaining pastry in plastic wrap; refrigerate.
Bake base for 15 minutes or until browned lightly. Cool for 10 minutes.
Spread lemon filling over base. Crumble reserved pastry over lemon filling; top with flaked almonds.
Bake for 25 minutes or until browned. Cool in pan; refrigerate until cold. Remove from pan; cut into 16 pieces. If you like, dust with a little sifted icing sugar before serving.
Lemon filling
Stir ingredients in a heavy-based saucepan over very low heat for 10 minutes, or until thickened (do not allow to boil or mixture will curdle). Pour mixture into a medium heatproof bowl; cover surface. Refrigerate for several hours or until thick and cold.
Baking paper is essential for this slice, as the lemon filling will otherwise make getting the slice out of the pan rather tricky!
Note