Childhood favourite, the marble cake, gets an update where precision results in a uniformly stripy sponge
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Consistency is key!
The batters have to be as similar in consistency as possible - so if too much colouring loosens one, either thicken it with a tablespoon of flour or add a splash of milk to the other to compensate.
Secrets of success
Speed is the key, so don’t be afraid to sacrifice a little accuracy when filling the tin. The slower you dollop in the batters, the more chance they’ll have to spread, and you might end up with a stack of pancakes rather than a swirly zebra!