Strawberry Rhubarb Pie

Name: Strawberry Rhubarb Pie
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American
Ingredients: 1 Double Pie Crust; 2½ cups strawberries (washed, hulled, and cut into pieces 16oz); 3 cups rhubarb (sliced into pieces a bit less than ½ an inch, stalks, no leaves.); ¾ cup sugar (plus more to taste); ¼ cup cornstarch; 1 tablespoon butter (room temperature cut into small pieces); ¼ teaspoon salt; 1 teaspoon vanilla; egg yolk to brush on the pie crust; coarse sugar for sprinkling on top (optional)