To stew apples and rhubarb: peel, core and roughly chop apples and roughly chop rhubarb. Place in saucepan with a little water (1 tablespoon approx) and place over a low heat, stirring occasionally until apples and rhubarb are softened. When soft, if liked, add a pinch of cinnamon.
Place the flour, sugar and oats into a bowl.
Add margarine and rub into the dry Ingredients with tips of your fingers to form a crumble.
Place the apples, rhubarb and berries in an oven-proof dish and sweeten with sugar.
Spread crumble over the apples.
Bake in the oven for 20-30 minutes approx.
Serve hot with cream, ice cream, custard, yoghurt or cr?me fraiche.
Note: apples and rhubarb can also be stewed in a microwave. Place fruit and water in a deep microwaveable bowl and cook on high for approx 5 minutes, stirring occasionally.