Preheat the Oven to Gas 5, 190°C, Fan 170°C. Grease a 23-25cm Baking Dish and Set Aside. Put 3 Cored and Thinly Sliced Apples and 6 Ripe Stoned and Thinly Sliced Plums in a Large Bowl and Add 1 tbsp Lemon Juice, 50g Demerara Sugar, 1 Level tbsp Corn Flour and 1 tsp Ground Cinnamon (If Using). Use your Hands to Mix the Filling. If Using any Delicate Fruit, Like Raspberries, Reserve to Add at the End – This will Ensure the Fruit Holds its Shape Better While it’s Cooking.
Tip the Fruit into the Prepared Baking Dish and Arrange in an Even Layer. Top with 75g Raspberries. Don’t Fill the Dish Completely with Fruit or there won’t be Enough Room for the Cobbler Topping, and the Juices Could Bubble Over During Cooking.