Making this silky smooth and creamy cranberry posset only requires three ingredients; heavy cream, sugar, and unsweetened cranberry juice.
Posset is a pretty magical dessert. It will remind you of a mousse, pudding, or panna cotta, but you don't need any eggs, gelatin, starch, or other thickeners. The magic lies in the combination of the boiled cream and the acid in the juice that causes the proteins in the cream to thicken.