I start by grating the cheeses and halving the garlic. Freshly grated cheese melts more smoothly, and rubbing the pot with garlic gives a subtle aroma that infuses the fondue. I mix cornstarch with a small portion of the cheese to prevent clumping.
Next, I gently heat the white wine and lemon juice in the pot over medium heat. I avoid boiling it to prevent the alcohol from evaporating too quickly, which keeps the fondue flavorful.
I add the cheese slowly, stirring constantly in a figure-eight motion until it melts into a smooth mixture. This step is key—I never rush it, or the cheese might separate.
Finally, I stir in the kirsch, pepper, and nutmeg. I keep the fondue warm on a portable stove and serve immediately with bread cubes, vegetables, or fruits.