The saying goes pink makes the boys wink, but I've found my niece and nephew love pink equally, and a pink sponge is always a winner in my household.
To achieve a pink sponge, instead of food colouring, I've used a natural additive: beetroot. Like carrots and courgettes, using beetroot in a sponge cake makes it a moist, and scrummy. Kids won't know it even has beetroot in it because they're enthralled by the colour.
Halve the amount of sugar and butter, if you dare, but for a truly indulgent treat, keep the quantities as they are and enjoy this not-so-naughty sponge, which is tasty as it is pretty.