I have made a large batch of Bumbleberry pie filling using cornstarch as the thickener and allowed it to cool for 24 hours but it is not quite thick enough. Should I just re-heat and add more cornstarch to thicken or is there a better way.
I have used a combination of rhubarb, blackberries, blueberries, strawberries and raspberries in the mixture. Some were frozen, some fresh.