Rub the inside of a fondue pot with the cut sides of the garlic clove. Discard the garlic or leave it in for a stronger flavor.
In the fondue pot, heat the wine and lemon juice over medium heat until hot but not boiling.
In a medium bowl, toss the grated Gruyère and Emmental cheeses with the cornstarch until the cheese is evenly coated.
Gradually add the cheese to the hot wine, stirring constantly in a figure-eight motion until the cheese is melted and smooth.
Stir in the kirsch.
Season with freshly ground black pepper and freshly grated nutmeg to taste.
Place the fondue pot on a stand over a low flame to keep it warm.
Enjoy your meal!