Posset, a classic British dessert, has evolved from a medieval spiced, curdled milk drink used for medicinal purposes to a simple, elegant cream pudding. Modern recipes typically involve heating cream and sugar with citrus juice, which sets into a velvety texture without eggs or gelatin. While lemon is the most popular flavor, other citrus fruits can be used. This dessert, once featured in historical texts like Shakespeare's Macbeth, is now appreciated for its ease of preparation and impressive presentation.