Preheat oven to 170 deg C. Line the base of a 8 inch cake pan.

Beat butter and sugar at medium speed till white and fluffy, about 5 minutes. Add in the eggs, one at a time, beating well after each addition.

Add black chia seeds, desiccated coconut and self raising flour in two portions into butter mixture. Gently fold well with a rubber spatula and pour in the remaining self raising flour.

Lastly add the vanilla extract and lemon juice, fold batter well again.

Pour batter into the prepared cake pan, smooth the top. Bake in the preheated oven for about 45-50 minutes or skewer inserted in the center comes out clean.

Allow cake to cool in pan for 10 minutes and unmould cake from pan, place on wire rack to cool completely. Dust some icing sugar over cake before serving.