For grates: With thinned royal icing, “paint” 9 pieces of spaghetti grey. Push into a craft block to dry. Carefully break spaghetti into graduated lengths to fit top of “grill”. For coals: Flatten marshmallows, paint deep grey. When dry, pat with confectioners sugar.
Make hamburgers and hot dogs out of candy clay. Indent and paint grate marks on hot dogs. Use a cut bag to flow thinned royal icing cheese over hamburgers. With leftover candy clay, make a 1 in. wide rim piece, the circumference of top.
Ice 2-layer cake smooth; top black, sides white. Position candy rim on edge of top. With toothpick, mark grill sides, 3 in. from top. Outline bottom of grill with Tip 8. Cover grill rim and sides with Tip 16 stars. Print Tip 3 message, then overpipe.
Place marshmallow “coals” and spaghetti “grates” on top. Edge top with Tip 6 outline.
Pipe Tip 8 outline legs and ball feet. Add Tip 233 grass at cake base.
Position hamburgers and hot dogs. Pipe Tip 70 spatula-striped leaf motion “flames” between grates.