Rhubarb Custard Pie
["2 c. rhubarb, cut in small pieces", "1 c. sugar", "1 large egg", "1 Tbsp. water", "1 Tbsp. flour"]
["Mix and pour into unbaked pie shell.", "Bake at 375\u00b0 about 1 hour."]
["rhubarb", "sugar", "egg", "water", "flour"]