How much batter do you use for a 10 sponge cake?

You need to provide more context for me to answer your question accurately. "10 sponge cake" isn't a standard size. Please clarify what you mean by "10 sponge cake."

Here are some possible interpretations and how to determine the batter amount:

* 10 servings of sponge cake: You'll need a recipe that yields about 10 servings. Check the recipe's serving size and adjust accordingly.

* 10 individual sponge cakes: You'll need a recipe that yields 10 individual cakes. Look for a recipe specifically for mini sponge cakes or cupcakes.

* 10" diameter sponge cake: This is a common size. You'll need a recipe that uses the appropriate amount of batter for a 10" cake pan.

To help me answer your question, please tell me:

* What size are the sponge cakes? (e.g., individual, serving size, 10" diameter, etc.)

* How many sponge cakes are you making?

Once I have this information, I can assist you in finding the right batter amount.