Sweet Potato Pie
["10-inch pie shell, partially baked", "3 eggs", "1 Tbsp. water", "2 Tbsp. butter", "2 c. mashed sweet potatoes", "1/2 c. sugar", "1 1/2 c. heavy cream", "1/4 c. chopped walnuts", "1/3 c. peach preserves", "1/2 tsp. salt", "3/4 tsp. cinnamon", "1/2 tsp. ginger", "1/2 tsp. nutmeg", "1/8 tsp. cloves"]
["Preheat oven to 350\u00b0.", "Separate 1 of the eggs.", "Beat the white with the 1 tablespoon of water; brush over partially baked crust and set aside."]
["pie shell", "eggs", "water", "butter", "mashed sweet potatoes", "sugar", "heavy cream", "walnuts", "preserves", "salt", "cinnamon", "ginger", "nutmeg", "cloves"]