Toss grated cheese with cornstarch in a ziploc bag. Set aside
Rub the inside of a 4 quart pot with the cut garlic, then toss into the pot. Add the wine and lemon juice to the pot and bring to a low simmer on medium heat
Slowly stir cheese into the wine; stir constantly to prevent the cheese from seizing. Cook just until the cheese is melted and creamy - do not let boil
Stir in the kirsch, mustard, and nutmeg
Transfer to a serving pot to keep warm (ex., fondue pot, instant pot) and serve with dippers