This is the most simple and basic sponge.
1000g - Butter
1000g - Sugar
1000g - Self Raising Flour
2 Tsp - Baking Powder
Pinch of Salt
8 - Eggs
Heavily cream the butter and sugar together either with a whisk or paddle in a kitchen aid (this step is essential). Add the eggs one at a time and beat well after each egg. At this stage you can add vanilla or any other desired flavours or colours. With the mixer on low slowly add the flour until it is just mixed. DO NOT OVER MIX! bake at 170C for around 1 hour or until a toothpick comes out clean.