This single serving grapefruit posset is a creamy no bake citrus dessert made with heavy cream, sugar, and fresh grapefruit juice, perfectly portioned for one.
In a small saucepan, combine the heavy cream and sugar. Cook over medium heat, stirring constantly, until the sugar dissolves and the mixture reaches a steady simmer. Let it gently simmer for 8 to 12 minutes.
Remove the pan from the heat. Stir in the grapefruit juice, vanilla extract, and grapefruit zest. Let the mixture sit for 5 minutes.
Pour into a 10-ounce ramekin or small dessert dish. Cover and refrigerate for at least 3 to 4 hours, or until set with firm edges and a softly set center.
Notes
Use Full-Fat Cream: Heavy cream is essential. Lower fat dairy will not thicken properly.
Simmer Long Enough: Let the cream simmer for the full 8 to 12 minutes. This reduces the liquid slightly and helps the posset set.
Do Not Boil Rapidly: Maintain a steady simmer with small bubbles and visible steam. A rolling boil can affect texture.
Use Fresh Grapefruit Juice: Fresh juice has the right acidity to thicken the cream and gives the best flavor.
Chill Completely: Refrigerate for at least 3 to 4 hours. The posset should feel firm around the edges and softly set in the center.
Make Ahead: This grapefruit posset can be made up to 2 days in advance and stored covered in the refrigerator.