In a small bowl, stir together the cornstarch and water until smooth. Generously rub the inside of a 1 1/2-quart enameled or stainless-steel-lined saucepan with garlic. Discard the garlic.
Pour in wine. Set the pot over medium-high heat and bring the wine to a bubble. Bubble 10 seconds, whisk in the cornstarch and then, off the heat, whisk in the cheeses in 3 additions. Blend in the lemon juice.
Set the pan back over medium to medium-high heat and stir about 3 minutes, or until the cheese is smooth. Season the fondue to taste with nutmeg and pepper. Turn it into a ceramic pot, set it over a low flame in the center of the table and start dunking the bread.
Once the cheese is gone, let a crust form on the pot's bottom. Stir in a splash of Kirsch or wine. Let it heat, and mop up the bits of crust with bread.
Nutrition information per serving:
Calories653Fat37 gSodium570 mg