Rainbow layer cake recipe | Good Food

Ingredients

• 340g unsalted butter softened, plus extra for the tins
• 340g caster sugar
• 6 large eggs
• 1 tsp vanilla extract
• 340g self-raising flour
• 1 tsp baking powder
• 2 tbsp milk
• 400g caramel or lemon curd
• 5 egg whites
• 375g caster sugar
• 500g unsalted butter cubed and softened
• 3 tsp vanilla extract
• food colouring gels (for Pride, the colours are red, orange, yellow, green, dark blue, purple, light pink, baby blue, brown and black)