Irish Cheddar and Stout Fondue

INGREDIENTS

• 1 pound Irish cheddar cheese, grated
• 2 cups very small brussels sprouts
• 6 tablespoons frozen apple juice concentrate, thawed
• 1 tablespoon Dijon mustard
• 2 1/2 tablespoons all purpose flour
• 3/4 cup (or more) Irish stout (such as Guinness)
• 2 apples, cored, cut into wedges
• 2 cups cauliflower florets
• 2 cups 1- to 1 1/2-inch-diameter red-skinned potatoes, halved