Sweet strawberries and tangy rhubarb combine in a beautiful, family-favorite pie with a flaky crust. This classic spring dessert balances fruity sweetness with tart complexity.
Preheat your oven to 425°F and place a rack in the lower third for better bottom crust browning.
Combine sliced strawberries, chopped rhubarb, sugar, flour, salt, and lemon juice in a large bowl; stir to coat evenly.
Roll out one pie crust and fit it into a 9-inch pie pan, ensuring there are no air pockets underneath.
Pour the strawberry-rhubarb filling into the crust, dot with butter, then cover with the second crust (lattice or full); crimp edges to seal.
Beat the egg and brush over the top crust for a golden finish; cut vents if using a full crust to allow steam escape.
Bake at 425°F for 15 minutes, then reduce to 350°F and bake for an additional 40–45 minutes until the filling bubbles and crust is golden; cool fully before slicing to set.