I am so glad for the Summer FINALLY coming! I was beginning to think that it was never going to come. To me nothing says summer like strawberry rhubarb pie, and coincidentally it happens to be National Strawberry Rhubarb Pie Day, bet you did not even know there was such a day. I have tried recipe after recipe for this pie, and haven't found any better than this one. I wish I could claim it as my own, but sadly no matter how hard I try Bon Appetit has me beat on that one. Definitely try this recipe for all the cookouts and potlucks you have coming up, every time I do I get so many people asking for the recipe.
1 large egg yolk beaten to blend with 1 teaspoon water (for glaze)
Combine flour, sugar and salt in processor. Using on/off 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. (Can be made 1 day ahead. Keep chilled. Let dough soften slightly at room temperature before rolling.)
Preheat oven to 400°F. 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 fourteen 1/2-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°F. Bake pie until golden and filling thickens, about 1 hour 25 minutes. Transfer pie to rack and cool completely.