In a large bowl combine the cheeses and cornstarch and toss to coat. Rub the inside of a heavy saucepan with the garlic and discard the garlic. Add the wine and lemon juice and bring the mixture to a boil. Stir in the cheese mixture gradually over moderate heat, stirring until smooth. Stir in the kirsch, if desired. Season with pepper and nutmeg. Simmer mixture for 2-3 minutes and transfer to a fondue stand set over a low flame. Serve immediately, taking care to remember to continually stir the fondue to prevent it from separating.
Recipe courtesy of Gourmet Magazine