Combine raspberries, sugar, and orange juice in a saucepan. Whisk the cornstarch into the cold water until smooth. Add the mixture to
the saucepan and bring to boil.
Simmer about 5 minutes, stirring constantly, until desired consistency. Sauce will thicken further as it cools. Pour over ice cream, brownies or just eat with a spoon! Makes 8 servings.