Follow the recipe for this pie... I chose to omit the lemon juice because I assumed (incorrectly) that the grapefruit juice would be tangy enough. False. The lemon juice is necessary. Without it, this pie is bland; grapefruit didn't have enough punch by itself.
Grapefruit Meringue Pie
1 pre-baked pie shell
5 tablespoons corn starch
1.5 cups water
1/2 cup grapefruit juice
2 tablespoons lemon juice - don't forget it
1 tablespoon grapefruit zest
3 large eggs, separated
3 tablespoons butter
Whisk together corn starch, 1.25 cups sugar and water. Add grapefruit and lemon juice, zest and egg yolks cook mixture over medium heat. Stir constantly until it begins to bubble and thicken (about 10 minutes).
Remove from heat and stir in butter. Pour into pie shell.
Beat egg whites to soft peaks. Add 5 tablespoons sugar in a slow, steady stream and continue to beat until volume has increased six times and the meringue makes pointy peaks.