Pineapple Filling

½ cup sugar
pinch of salt
3 tablespoons cornstarch
1 (20 ounce) can crushed pineapple
3 tablespoons butter

In a saucepan combine sugar, salt, and cornstarch. Add pineapple, including juice, and mix well. Cook over medium heat until mixture comes to a boil, stirring constantly. Continue cooking and stirring for approximately 4 to 5 minutes. Mixture will thicken and lose its milky look. Remove from heat, and stir in butter. Allow mixture to cool. Cover and store in refrigerator until ready to use. Makes enough to fill a three-layer cake.