Preheat oven to 350°
In a large bowl combine rhubarb chunks and strawberries.
Cover with sugar and corn starch. Add orange extract (or juice). Stir the fruit until evenly coated and combined.
Transfer the fruit mixture to a baking dish and set aside. No need to grease pan.
Mix the crumble topping in a food processor or cut together with a pastry knife or fork. Top the fruit mixture with crumble topping. Bake for 53-55 minutes or until fruit is bubbling and the crisp is golden.
Serve warm with vanilla bean ice cream.