Hi there!
It was probably the 1/2 syn cake recipe, which is this:
1. Whisk 4 egg whites in a bowl until they reach soft peak stage
2. In another bowl, whisk together 4 egg yolks, 4tbspn sweetener, half tub a quark, 1 tsp baking powder (1/2 syn), 1/2 tsp vanilla extract. Then whisk in half the...