A week after my boyfriend's birthday, it was my sister's birthday :) She turned the big 3 - 0! So obviously I decided to make her a cake in the shape of a '30' for her birthday BBQ. She wasn't too fussy about the flavour of the cake, so my mom suggested a pound cake as a lot of our family likes that. I mixed up her classic recipe by separating the eggs and whipping the egg whites to stiff peaks before mixing it into the batter. This made the cake less dense but kept the rich buttery flavour…