A buttery vanilla shortbread crust and crumble sandwich a jammy tart-sweet strawberry rhubarb filling brightened with fresh orange zest. These bars feel like spring baking at its best.
Prep the pan: Preheat oven to 350°F. Line an 8x8-inch pan with parchment paper.
Cook the filling: Add strawberries, rhubarb, sugar, and orange zest to a saucepan over medium heat. Cook 8–10 minutes until softened. Stir together cornstarch and orange juice until smooth, then add to the fruit and cook 2–3 minutes until glossy and thickened. Set aside.
300 g fresh strawberries, 200 g fresh rhubarb, 100 g granulated sugar, 1 teaspoon orange zest, 2 tablespoons cornstarch, 1 tablespoon fresh orange juice
Make the crumble: Mix flour, sugar, and salt. Stir in the combined butter and vanilla until the mixture becomes crumbly.
240 g all-purpose flour, 200 g granulated sugar, 170 g unsalted butter, ½ teaspoon salt, 1 teaspoon vanilla extract
Bake the crust: Press about two-thirds of the dough firmly into the pan. Bake 12–15 minutes until lightly golden.
Assemble: Spread filling over crust. Crumble remaining dough evenly over top.
Bake: Bake 30–35 minutes until golden and bubbling.
Cool: Let cool completely before slicing. Refrigerate briefly for the cleanest cuts if desired.