Place uncooked Rhubarb chunks and Cherries in a large bowl, sprinkle Demerara sugar on top, then stir in the lemon juice and vanilla extract, set aside.
For the Crumble topping
Combine all the crumble topping ingredients together in a bowl, mix with the tips of your fingers, until it resembles bread crumbs (or pop it all in a food processor and whizz!)
Directions
Spoon the mixed fruit into 2 oven proof dishes, sprinkle the crumble mix on top of each.