This recipe, from Bon Appetit magazine, is the first I used for strawberry-rhubarb pie and the one I made for Richard. As he advises, you can always add more strawberries.
Pastry
3 cups flour
2 1/2 teaspoons sugar
3/4 teaspoon salt
2/3 cup chilled solid vegetable shortening, cut into small pieces
1/2 cup plus 2 tablespoons (1 1/4 sticks) chilled
unsalted butter, cut into pieces
10 tablespoons (approximately) ice water
Filling
3 1/2 cups 1/2-inch thick slices trimmed rhubarb (approximately 1 1/2 pounds untrimmed)
1 16-ounce container strawberries, hulled and halved (approximately 3 1/2 cups)
1/2 cup (packed) golden brown sugar
1/2 cup sugar
1/4 cup cornstarch
1 teaspoon ground cinnamon
1/4 teaspoon salt
1 large egg yolk beaten to blend with 1 teaspoon
water (for glaze)
For pastry crust: Combine flour, sugar and salt in the bowl of a food processor. Using off/on turns, cut in shortening and butter until coarse meal forms. Blend in enough ice water 2 tablespoons at a time to form moist clumps. Gather dough into ball; cut in half. Flatten each half into disk. Wrap separately in plastic; refrigerate until firm, about 1 hour.
For filling: Preheat oven to 400 degrees. Combine first 7 ingredients in large bowl. Toss gently to blend.
Roll out 1 dough disk on floured work surface to 13-inch round. Transfer to 9-inch diameter glass pie dish. Trim excess dough, leaving 3/4-inch overhang.
Roll out second dough disk on lightly floured surface to 13-inch round. Cut into 14 half-inch-wide strips. Spoon filling into crust. Arrange 7 dough strips atop filling, spacing evenly. Form lattice by placing remaining dough strips in opposite direction atop filling. Trim ends of dough strips even with overhang of bottom crust. Fold strip ends and overhang under, pressing to seal. Crimp edges decoratively.
Brush glaze over crust. Transfer pie to baking sheet. Bake 20 minutes. Reduce oven temperature to 350 degrees. Bake pie until golden and filling thickens, about 1 hour 25 minutes. Transfer pie to rack and cool completely. Makes 8 servings.

