- STEP 1
Make topping: In medium bowl, with hands, combine flour, oats, brown sugar, almonds, lemon zest and salt. Add butter and squeeze to form small clumps. Refrigerate until ready to use.
- STEP 2
Heat oven to 375°F. Fit dough into bottom and up side of 9-inch pie plate. If necessary, trim dough so overhang is even all the way around (about 1/2 inch from edge of pie plate). Fold overhang under itself to create thicker rim of dough and crimp as desired. Refrigerate at least 20 minutes
- STEP 3
Make filling: In large bowl, mash blackberries and granulated sugar. Add pears, corn-starch, cinnamon, lemon zest and salt and toss to combine.
- STEP 4
Transfer to pie crust, top with crumb mixture and transfer to rimmed baking sheet. Bake until pears are tender and topping is golden brown, 1 to 1 1/2 hour, making sure to cover with foil if topping or crust begins to get too dark.