Classic Cheese Fondue

Ingredients

• 1/4 teaspoon freshly ground white pepper
• 2 teaspoons freshly squeezed lemon juice
• 8 ounces Gruyere cheese, cut into 1/4-inch cubes
• 1/8 teaspoon cayenne pepper
• 1 1/3 cups medium-bodied white wine, such as Riesling or Sauvignon Blanc
• 1 tablespoon kirsch
• Sourdough bread, cut into 1-inch cubes , for serving
• 2 tablespoons all-purpose flour
• 4 ounces aged Emmental cheese, cut into 1/4-inch cubes