Oregon Raspberry Sauce Posted on November 21, 2014 by Darcy Zettler Kochis Raspberry Puree works well for so many desserts and main dishes. Make a slurry of lemon juice, cornstarch, and Oregon Raspberries. Ingredients Preparation Sauce 1 lb raspberry puree ½ cup sugar 1½ Tablespoons lemon juice 2 teaspoons cornstarch< Sauce Steps Cook puree and sugar to 160 degrees. Make a slurry with lemon juice and cornstarch. Add to raspberries puree and cook for 3 more min, or until cornstarch is completely cooked.