Step 1

Preheat oven to 180°C/160°C fan-forced. Grease a 3cm-deep, 20cm x 30cm (base) lamington pan. Line with baking paper, allowing 2cm overhang on all sides.

Step 2

Using an electric mixer, beat butter and 1/2 cup sugar until light and fluffy. Add 1 egg. Beat until combined. Sift flours over butter mixture. Stir to combine. Stir in buttermilk. Press mixture over base of prepared pan. Spread jam over mixture.

Step 3

Whisk remaining eggs and sugar together in a bowl. Stir in coconuts. Sprinkle mixture over jam. Bake for 35 to 40 minutes or until light golden. Cool in pan. Cut into pieces. Serve.