Combine the shredded Grand Cru®, Little Mountain, Pleasant Ridge Reserve, 1 cup wine and lemon juice in a large bowl. Cover and let stand for 2 hours at room temperature.
Whisk cornstarch and remaining wine in a small bowl until smooth. Place salt into a large saucepan. Starting in the salt, rub the cut sides of garlic on pan. Discard garlic. Add wine mixture; bring to a boil over medium heat. Cook and stir until thickened.
Reduce heat to low. Gradually whisk in cheese mixture until melted. (Do not boil.) Season with nutmeg and pepper to taste.
Transfer to a fondue pot. Heat on low to keep warm. Serve with dippers.