📖 Instructions

1. Preheat your oven to 375°F (190°C). This ensures your oven is perfectly heated and ready for baking once the crisp is assembled. If you have a convection setting, now's a great time to use it for an extra crispy topping!
2. Prepare the rhubarb: Wash the rhubarb stalks thoroughly. Trim off the very ends and any leaves (rhubarb leaves are toxic, so ensure they are discarded). Slice the rhubarb stalks into 1/2-inch (about 1.25 cm) pieces. You'll want about 4 cups worth.
3. Prepare the strawberries: Gently wash the strawberries. Hull them by removing the green tops. Slice the strawberries into halves or quarters, depending on their size. Aim for pieces roughly the same size as your rhubarb to ensure even cooking. You'll need about 2 cups.
4. Combine the filling ingredients: In a large mixing bowl, gently combine the prepared rhubarb and strawberries. Add 1/2 cup of granulated sugar, 1/4 cup of all-purpose flour, 1 teaspoon of vanilla extract, and 1 tablespoon of fresh lemon juice (this really brightens the flavors!). Toss everything together until the fruit is evenly coated. The flour helps to thicken the juices as it bakes, preventing a watery filling.
5. Pour filling into baking dish: Transfer the fruit mixture into a 9x13 inch (23x33 cm) baking dish. Spread it out evenly. Set this aside while you prepare the topping.
6. Prepare the topping dry ingredients: In a separate, medium-sized mixing bowl, whisk together 1 cup of rolled oats, 1/2 cup of all-purpose flour, 1/2 cup of packed light brown sugar, 1/4 cup of granulated sugar, 1/2 teaspoon of ground cinnamon, and 1/4 teaspoon of salt. Make sure there are no lumps in the brown sugar.
7. Incorporate the butter into the topping: Add 1/2 cup (1 stick) of cold unsalted butter, diced into small cubes, to the dry topping ingredients. Using a pastry blender, two forks, or even your fingertips, cut the butter into the mixture until it resembles coarse crumbs with some pea-sized pieces remaining. The key here is to keep the butter cold, which helps create that wonderfully crumbly and crispy texture.
8. Assemble the crisp: Evenly sprinkle the oat topping mixture over the fruit in the baking dish. Don't press it down; you want it to be light and airy for maximum crispness.
9. Bake the crisp: Place the baking dish on a baking sheet (to catch any potential overflow of bubbling juices – learned that the hard way!). Bake in the preheated oven for 40-45 minutes, or until the topping is golden brown and the fruit filling is bubbly around the edges. You should see those delicious juices thickening!
10. Cool and serve: Carefully remove the crisp from the oven using oven mitts. Let it cool on a wire rack for at least 15-20 minutes before serving. This allows the filling to set slightly. Serve warm, ideally with a scoop of vanilla ice cream or a dollop of fresh whipped cream. Enjoy every single bite!