In a saucepan, combine strawberries and sugar; bring to a boil. Combine cornstarch and cold water; whisk. Add cornstarch mixture to strawberries and whisk to combine. Bring to a boil and continue boiling 5 minutes or until sauce is thick. Set aside. The sauce will thicken more upon cooling.
*for a thinner sauce add an additional 1/2 c water. Make this addition to the strawberries and sugar and water, boil. Continue recipe with adding cornstarch.