Peel the apple and pears, then arrange them in a deep baking dish. Squeeze half a lemon over them. Scatter the ginger bits on top and dust with sugar and cinnamon.
In a large bowl, mix the oat, flour, ground almond, ground cinnamon and ginger Add the margarine/butter (cubed) and rub with the mixture using your fingertips until you get a rough crumble. Mix in the sugar.
Cover the fruits evenly with the crumble and, using the base of a spoon, press the mixture down slightly.
Put the dish in the fridge for 15 minutes or until you’re ready to bake.
Heat the oven to 180°C.
Bake the crumble for 20-25 minutes until golden.
Serve with (vegan) custard, yoghurt or ice-cream.