In 1-quart saucepan, stir together granulated sugar, cornstarch and water. Stir in 1/2 cup of the strawberries. Heat to boiling, stirring frequently. Reduce heat to low. Cook 3 to 5 minutes, stirring frequently, until slightly thickened. Cool 10 minutes. Stir in remaining 1 cup strawberries. Cover and refrigerate until ready to serve.