I love the ease of crisps. "Easy as pie" should be replaced with "Easy as crisp."
Preheat oven to 375°. Combine: 4-5 cups sliced strawberries, 4-5 cups diced rhubarb, 3/4 cup sugar, 5 tablespoons flour, and 1 teaspoon lemon zest. Place in a 9 x 13 pan.
Mix together: 3/4 cup flour, 1 cup brown sugar, 1 cup oats, and 1 tablespoon cinnamon. Cut in 3/4 cup butter. Place mixture over fruit, the top with 3/4 cup chopped walnuts. Bake for 45 minutes. Serve warm.
Thanks for the tangy combination of strawberries and rhubarb.