Deep, dark, satisfying and smooth: this chocolate terrine is like a richer, more set chocolate mousse. Chocolate terrines can be made in advance and frozen, which is a bonus for getting ahead if you’re hosting. The addition of fresh pitted cherries cuts through the chocolate, but can be subbed for raspberries. Serve this in slices with a dollop of creme fraiche and some little biscuits such as amaretti, brandy snaps or shortbread.