In bowl, toss cheese with cornstarch to coat. Set aside.
In heavy-bottomed medium saucepan, combine wine and garlic. Cover and simmer 2 min. over medium heat. Uncover and discard garlic. Reduce heat to medium-low. Whisk in mustard. Adding a handful at a time, whisk in cheese mixture until smooth after each addition. Whisk in cream, lemon juice, kirsch or brandy (if using), nutmeg and pepper until smooth. Adjust consistency, if desired, by whisking in additional spoonfuls of cream.
Pour into heated fondue pot or other gentle heat source such as slow cooker or double boiler. Serve with assorted foods for dipping: crusty bread, cooked potatoes, raw vegetables such as broccoli, cauliflower, cornichons, mushrooms, or fruits such as apple and pear.