To make the crumble topping, combine the flour, light brown sugar, baking powder, cinnamon and salt in a large mixing bowl. Stir briefly to mix. Add in the cold butter, and using your fingertips, or a pastry cutter, rub the butter into the dry ingredients until large crumbs and clumps form. Set aside in the fridge.
120 g all-purpose flour, 80 g light brown sugar, ½ teaspoon baking powder, ½ teaspoon cinnamon, ¼ teaspoon salt, 100 g butter
Preheat the oven to 190°C while you pit and halve the cherries.
800 g cherries
Add the halved cherries to a 25x25cm baking dish and add to it the sugar, corn flour, lemon juice and vanilla. Mix very well, making sure there are no corn flour lumps. Scatter the dark chocolate evenly over the top of the cherries.
2-3 tablespoons white sugar, 1 tablespoon corn flour, 1 teaspoon lemon juice, 1 teaspoon vanilla paste, 100 g dark chocolate
Scatter the chilled crumble mixture evenly over the chocolate and cherries and bake for 35 to 40 minutes, until the crumble topping is a deep golden colour and the fruit juices are bubbling up around the edges
Allow to set and cool for 5 to 10 minutes and then serve, with any fruit juices from the bottom of the baking dish and vanilla ice cream.