About this recipe:This colourful spongecake is sure to delight. Six different colours of cake batter are mixed together to create this rainbow cake. You can also use this recipe to make cupcakes. Top with your favourite frosting.
3 egg whites
520g sponge cake mix
2 tablespoons vegetable oil
red paste food colouring
orange paste food colouring
yellow paste food colouring
green paste food colouring
blue paste food colouring
purple paste food colouring
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Method Prep:30min › Cook:30min › Ready in:1hr
Preheat an oven to 180 C / Gas 4. Grease and flour two 20cm round cake tins.
Beat the egg whites with an electric mixer until frothy, about 1 minute. Add the sponge cake mix, water and rapeseed oil; continue beating for 2 minutes on medium speed.
Divide the cake batter into six separate bowls. Use a cocktail stick to scoop a dab of food colouring into one bowl of batter and stir; add more food colouring, if necessary, to reach the desired shade. Repeat with the remaining colours and bowls of batter.
Scoop spoonfuls of batter into the prepared tins, alternating the colours. Use a cocktail stick to gently swirl the colours for a marbled effect.
Bake in the preheated oven until a cocktail stick inserted into the cake comes clean, about 30-35 minutes. Cool in the tins for 10 minutes before removing to cool completely on a wire rack.
Food colouring pastes are more concentrated than liquid food colourings and are necessary for this cake. They are available at specialty kitchenware stores or online.