Strawberry-Blueberry Jam 3 c. strawberries 3 c. fresh blueberries 3 c. sugar 1-1/2 c. light corn syrup 1/3 c. lemon juice Crush strawberries and blueberries. Place berries, sugar, corn syrup and lemon juice in a large saucepan and bring to a full rolling boil over high heat. Stir constantly. Reduce heat and stir frequently. Boil for 50 minutes. Remove from heat and skim. Pour into hot 1/2 pint jars. Seal and process in boiling water bath for 5 minutes.