Clear Lemon Filling
["3/4 c. sugar", "3 Tbsp. cornstarch", "1/3 tsp. salt", "1 1/2 tsp. lemon rind", "6 Tbsp. butter", "3/4 c. water"]
["Mix together and bring to a boil for 1 minute, stirring constantly.", "Chill."]
["sugar", "cornstarch", "salt", "lemon rind", "butter", "water"]