Step 1

Make **streusel topping**. Process ingredients until combined. Enclose dough in plastic wrap; freeze for 1 hour or until firm.

Step 2

Preheat oven to 180°C. Grease a 20cm x 30cm rectangular slice pan; line base and long sides with baking paper, extending the paper 5cm over the sides.

Step 3

Beat butter, sugar and egg yolks in a small bowl with an electric mixer until pale and fluffy. Transfer to a large bowl; stir in sifted flours and custard powder. Press mixture into pan.

Step 4

Bake base for 25 minutes or until golden brown. Cool in pan for 15 minutes.

Step 5

Meanwhile, place apples, honey and rind in a medium saucepan over medium heat; cook, covered, stirring occasionally, for 5 minutes or until apples are tender. Remove from heat; drain. Leave to cool for 15 minutes.

Step 6

Spread cooled apple mixture on base; coarsely grate streusel topping over apple.

Step 7

Bake slice for 20 minutes or until browned lightly. Cool in pan.