Heat the oven: Preheat the oven to 180°C fan/200°C/400°F/Gas Mark 6.
Mix the filling: Place the rhubarb in an ovenproof dish with the brown sugar, plain flour, vanilla extract and zest and juice of the orange. Mix everything together well.
Rub the topping ingredients: Make the topping by combining all the ingredients together in a bowl and rubbing together with your hands until it is crumbly, with a few bigger clumps.
Combine and bake: Scatter the topping mixture over the rhubarb and bake for 30 minutes until the top is golden and crunchy.
Did you make this recipe? Click here to let us know how it went and give it a ⭐️ rating! Your feedback helps us to make more recipes you really want.