Walnut and Date Piecrust

Name: Walnut and Date Piecrust
Cook time: 1 h 20 min
Total time: 1 h 20 min
Cuisine: Middle Eastern
Ingredients: 2.5 cups walnuts (about 9 ounces); 8 pitted Medjool dates (about 3 1/2 ounces), roughly chopped; 0.25 cup uncooked old-fashioned rolled oats; 0.25 cup unsweetened cocoa, plus more for crimping crust, if desired; 1 tablespoon tahini; 0.5 teaspoon kosher salt; Cooking spray