Take off the heat, stir in the rhubarb and tip the mixture into a wide ... Bake the crumble for 35–40 minutes until the top is golden and crisp and the fruit underneath is bubbling.

James Martin’s classic rhubarb crumble recipe will take you to comfort food ... or until the crumble topping is crisp and golden-brown and the rhubarb filling has softened and is bubbling.