1Heat oven to 350°F (325°F for dark or nonstick pans). Grease 3 (8- or 9-inch) round cake pans with shortening; lightly flour.
2In large bowl, mix flour, sugar, cocoa, baking soda and salt. In another large bowl, beat oil, buttermilk, eggs, food color, vinegar and vanilla with electric mixer on low speed just until blended. Gradually add flour mixture; beat 2 minutes on medium speed, scraping bowl occasionally. Pour into pans.
3Bake 23 to 25 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes; remove from pans to cooling racks. Cool completely, about 1 hour.
4Brush off all loose crumbs from cake layers. Place 1 cake layer, rounded side down, on serving plate; spread with 1 cup frosting. Top with second cake layer, rounded side up. Spread with 1 cup frosting. Top with third cake layer. Spread very thin layer of frosting on side to seal in crumbs. Spread remaining frosting on side and top of cake. Cut licorice into pieces. Pile licorice on top of cake. Decorate bottom edge of cake with jelly beans.