Many years ago (35+) my grandmother received a container of a 'sponge cake improver' from a family member whom was a commercial baker. She describes it as looking like a thick amber liquid or paste.
The method of using it was to put two teaspoons of this improver into a mixer with all the other ingredients, beat on high, and then turn into the cake tin. The result was a high quality sponge, every time.
I've tried searching for what this product might be called, but turned up short.
Without resorting to scouring a commercial baking centre - can someone identify what this commercial sponge cake improver would be?