|White sugar||1⁄4 Cup (4 tbs)|
|Baking powder||1⁄4 Teaspoon|
Beat egg whites until stiff, fold in remaining ingredients, spread on pie, and bake until nicely browned.
Chill 2 to 3 hours before serving.
N.B. If using frozen rhubarb add 3 tablespoons flour to custard sauce