This classic cobbler is a comforting dessert that is perfect for a cozy night in. The cobbler is made with a buttery biscuit topping and a sweet and tangy strawberry and rhubarb filling. To make the filling, mix together sliced strawberries and rhubarb with sugar, cornstarch, and lemon juice. Pour the filling into a baking dish and top with the biscuit dough. Bake until the topping is golden brown and the filling is bubbling.