Preparation Preheat oven to 325°F. Butter 13x9x2-inch glass baking dish. Mix graham crackers, 6 tablespoons butter, and 2 tablespoons brown sugar in medium bowl. Press mixture evenly onto bottom of prepared dish. Bake crust until golden brown, about 12 minutes. Whisk flour, cinnamon, baking powder, salt, and allspice in medium bowl; blend well. Using electric mixer, beat 4 tablespoons melted butter, 1 cup brown sugar, eggs, lemon peel, and vanilla in large bowl until mixture is blended and thick, about 4 minutes. Beat in flour mixture. Fold in apples and walnuts. Spoon batter over crust. Sprinkle with 3 tablespoons sugar. Bake cake until golden brown and firm to touch in center, about 38 minutes. Cool cake completely in dish. Cut into squares and serve.
Preparation Preheat oven to 325°F. Butter 13x9x2-inch glass baking dish. Mix graham crackers, 6 tablespoons butter, and 2 tablespoons brown sugar in medium bowl. Press mixture evenly onto bottom of prepared dish. Bake crust until golden brown, about 12 minutes. Whisk flour, cinnamon, baking powder, salt, and allspice in medium bowl; blend well. Using electric mixer, beat 4 tablespoons melted butter, 1 cup brown sugar, eggs, lemon peel, and vanilla in large bowl until mixture is blended and thick, about 4 minutes. Beat in flour mixture. Fold in apples and walnuts. Spoon batter over crust. Sprinkle with 3 tablespoons sugar. Bake cake until golden brown and firm to touch in center, about 38 minutes. Cool cake completely in dish. Cut into squares and serve.