Lemon Posset is one of those simple yet without doubt impressive desserts using three humble ingredients, lemon (or other citrus fruit, orange, lime even grapefruit) sugar and cream. With it's origins dating back to the middle ages, a posset was in fact a drink used as a curative to the common cold and flu. In those day's it was actually a drink of hot curdled milk infused with spices such as cinnamon and nutmeg, sugar or honey and laced with…