Hello,
One of the most simple ways to make a sponge iS is what I call the the all in one sponge.
3 eggs.........weigh your eggs in the shell.
Wat ever your eggs weigh use that weight of .....
Self Raising Flour
Caster Sugar
Butter/Marg
preheat oven to 175c........gas 5 and drop to 165 if your oven has a fan.
Cream the butter and sugar until fluffy and white.
Slowly add the beaten eggs....if it starts to curdle add alittle flour
lastly sieve in the flour and carefully fold in.
Spread into a suitable size tin and bake until well risen and springing back.
Any thing can be added to the mix nuts, cherries, sultanans etc
HAPPY COOKING