INGREDIENTS
1 tsp
Grapefruit, red zest
9
Egg whites, large
5
Egg yolks, large
2 tbsp
All-purpose flour
1
Confectioners' sugar
2 tbsp
Cornstarch
1 pinch
Cream of tartar
1/2 cup
Granulated sugar
1 pinch
Salt, coarse
1 3/4 cups
Grapefruit juice
1
Butter, Unsalted
3/8 cup
Greek yogurt
1
Tablepoon finely grated fresh ginger