Eversince I made this cake, I've had pink on the brain. Truth is, I've never thought much of the taste of beetroot -  each time I've eaten it, I just haven't been able to get away from the association with sugar and earth. Beetroot is often described as "earthy" but the first time I tried it, I was quite surprised to find that it was an almost literal description of the luridly bright tuber.

Now the colour, oh, the colour, is something else altogether! I've always adored the vivid, almost vi...