I always make Nigella's Birthday Custard Sponge for birthdays. Can I add gel food colouring to it please? Or would I be better with a plainer sponge cake base? Many thanks.
If you are only adding yellow gel to the sponge, to intensify the colour, then it would be fine. If you are wanting to make a sponge with different colours then it is probably better to use a different recipe as the colour will be muted due to the yellow colour. Nigella's Victoria Sponge also has a fairly deep yellow colour due to the eggs and butter so it may be worth considering the Vanilla Layer Cake With Ermine Icing as this has a slightly paler yellow sponge cake due to the vegetable shortening and milk in the batter. It is worth noting also that the colours of a cake batter become more muted when the sponges are baked and as we have not tried the Vanilla Layer Cake with gel colours, we are unable to guarantee the results.