5 pound(s) medium-size garnet yams or sweet potatoes
1 1/4 cup(s) graham cracker crumbs
1/2 cup(s) toasted walnuts
1 tablespoon(s) firmly packed brown sugar
1/4 cup(s) butter, melted
Recipe
. To make marshmallows: Brush a 9-inch-square pan with oil. Generously dust with confectioners' sugar, tapping out excess. In the large bowl of an electric mixer, pour 1/2 cup water. Sprinkle gelatin on top; let stand until gelatin softens, about 5 minutes.
2. In a small saucepan over medium-low heat, combine granulated sugar, corn syrup, and 3 tablespoons water. Bring to a boil, stirring to dissolve sugar. Continue boiling, without stirring, until syrup reaches 240 degrees (soft-ball stage) on a candy thermometer. Immediately remove pan from heat.
3. Using the whisk attachment of a mixer, beat gelatin mixture at high speed. Gradually add hot syrup in a thin, steady stream. Beat 5 minutes longer, until mixture is white, fluffy, and stiff. Beat in vanilla. Pour marshmallow mixture into prepared pan. Using a spatula brushed with oil, spread marshmallow evenly in pan. Let stand uncovered at room temperature 10 to 12 hours.
4. Dust a large cutting board with confectioners' sugar. Brush a knife with oil, then cut around marshmallow edges to loosen from pan. Cut marshmallow into quarters. Using a spatula brushed with oil, transfer pieces to the cutting board. Cut marshmallow quarters into 1-inch squares.
5. To make yams: Preheat oven to 400 degrees. Place yams on a baking sheet; roast 50 to 60 minutes, or until fork-tender. Let cool completely. Peel yams, cut into 1-inch squares, and set aside.
6. Reduce oven temperature to 350 degrees. In a food processor, combine graham cracker crumbs, walnuts, and brown sugar until nuts are finely ground. Transfer to a bowl, add butter, and toss with a fork until crumbs are evenly moistened. Press crumbs onto bottom of a 13" x 9" x 2" glass dish. Arrange yams on crust. Top evenly with marshmallows. Bake until marshmallows are melted and browned on top, 25 to 30 minutes.