This lusciously creamy dessert doesn’t require any baking whatsoever - just a bit of simmering and chilling in the refrigerator overnight. It’s the perfect make-ahead dessert that feels incredibly sophisticated, but is secretly a cinch to whip up. The posset is a dessert of British origin, and this version has a southern Italian spin with limoncello, lemon and basil. You can serve this up in ramekins, wine glasses, or any vessel you want - but we particularly love using hollowed-out lemon halves.