This classic pie is a must-have for any summer gathering. The pie is made with a flaky crust 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 the pie crust and top with a second crust. Bake until the crust is golden brown and the filling is bubbling. Serve warm with a scoop of vanilla ice cream.