Preheat oven to 375.

Combine rhubarb, strawberries, sugar, and flour in a large mixing bowl. Let sit for 10 minutes to allow sugar to draw juices from fruit. Meanwhile, In a large mixing bowl, combine flour, brown sugar, salt, cinnamon, and nutmeg. Add butter. Using a pastry blender cut the butter into the dry ingredients until the mixture resembles coarse breadcrumbs.

Pour fruit mixture into the bottom of a greased 8x8 baking dish. Sprinkle crumble mixture over top of the fruit. Bake for 45 minutes, or until golden brown.

Serve warm with ice cream or whipping cream..