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["1. Combine rhubarb, strawberries and lemon juice in a saucepan.", "2. Cook over medium heat, stirring occasionally, until fruit is softened. What you want here is the consistency of preserves, if not full-on jam. This can take anywhere from 8-20 minutes depending on how long you break it down. I cooked the filling for 20, so my filling was jam-consistency. If you do it for less time, you can have some fruit chunks. I think this is a matter of personal preference, but I think the bars will hold together better if the filling is more like jam.", "3. Combine the sugar and cornstarch in a small bowl then stir it into the strawberry/rhubarb mixture. Now bring it up to a boil, and let it boil until thickened, which should take about 1 minute once it comes to a boil. Then take it off the stove and set it aside.", "4. Make sure the oven is preheated to 350 F. Combine all the ingredients for the crust in a mixing bowl. Using a mixer, beat (on low) until you have a coarse, crumbly mixture.", "5. Reserve 1 1/2 cups of the crumb mixture. Press the rest onto the bottom of a non-stick baking spray coated 9x13"" pan.", "6. Spread the filling over the crust, and sprinkle the rest of the crumbs on top.", "7. Bake for 30-35 minutes, until golden brown.", "Recipe modified from Land O Lakes."]