Put the cream and the blossoms into a heavy bottomed sauce pan and stir to combine. Cook over medium heat, stirring occasionally, until the mixture just comes to a simmer. Turn off heat and let mixture cool to room temperature. Cover, put in the refrigerator, and leave for at least 8 hours (I chill it overnight), making sure that the flowers are immersed in the cream.
Strain the cream through a fine mesh sieve. Measure out 1 1/2 cups. (You'll have a bit left over)
Whisk the egg yolks and sugar together in a saucepan. Add the strained cream (1 1/2 cups) and the grapefruit juice.
Cook over medium heat, stirring constantly, until the mixture just comes to a slight simmer and thickens. Don't boil.
Pour the thickened mixture into small glasses or cups, you should have four servings.
Refrigerate until fully chilled, or overnight.
Garnish with a blossom or a twist of grapefruit zest if you like.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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