1 Graham Cracker Crust
3/4 cup sugar
1/3 cup cornstarch
1/4 tsp salt
1 1/4 cups grapefruit juice
1/2 cup water
4 eggs, separated (whites will be used in meringue)
4 tbsp butter, cut into small pieces
1 tsp grated grapefruit rind
Meringue
Mix the sugar, cornstarch, and salt in a medium saucepan, off the heat.
Add the grapefruit juice and water and stir with a whisk.
Add the egg yolks and whisk until the mixture is well blended and of uniform color.
Cook over medium heat for about 5 minutes. The mixture will thicken and start to bubble. It should be thick enough so that it holds its shape when you stir it. Remove from the heat and stir in the butter and rind. The mixture will be thick and range in color from yellow to pink, depending on the color of the grapefruits.
Pour the mixture into a baked pie crust and cover it with plastic wrap to keep a skin from forming on top.
Prepare the meringue.
Preheat the oven to 350 degrees.
Remove the plastic wrap from the pie and spread the meringue over the filling. Bake for about 20-25 minutes. The meringue should be lightly browned. Check it frequently for the last 5-10 minutes to make sure the peaks don’t burn.