grapefruit, gin & tonic cake + a marmalade

Citrus is a winter fruit here, a time when the local fruit is at its very best. It is, however, in most places generally available all year round and this grapefruit, gin and tonic cake is equally enjoyable in the warmer weather as it is in the cooler months. You could jazz up the presentation with some slices of fresh or candied grapefruit and some flo…