Sam has, for as long as I can remember, claimed lemon posset as his favourite pudding. Whenever I asked him what he wanted after supper or Sunday lunch, that would be his answer. I, on the other hand, could never be pinned down to one: the thought of having to choose between sticky toffee pudding and trifle, creme brûlée or tiramisu is horrifying. Even asking me to choose a winner between lemon sponge and ginger sponge is asking too much. I’m a flighty pudding eater, and I refuse to rank them. But Sam remained steadfast and certain: lemon posset.