Preheat oven to 180°C. Line a 20cm x 30cm lamington tray with Multix Baking Paper.
Sift together the flours and set aside.
Using an electric mixer, beat the eggs and sugar until fluffy and
doubled in size. Gently mix through the flour making sure it’s well
incorporated.
Pour the 60g butter in slowly and fold carefully through.
Pour mixture into the prepared tin and bake for 18-20 minutes, until
soft and spongy to touch. Leave to cool in tin for 10 minutes. Transfer
to a cooling rack. Cut sponge into 5 cm cubes.
Stir together the icing sugar and 1 tbsp butter. Add enough boiling
water to make a runny icing. Divide icing in 3 and mix in food
colouring.
Pierce the sponge cubes with a fork and dip into the icing. Dip sponge in the coconut. Place onto baking paper and leave to dry.