Step 1

Rub inside of heavy pot or saucepan with cut sides of garlic, then discard the garlic. Add beer and bring to a simmer over moderate heat.

Step 2

Coat the grated cheese with the cornstarch. Gradually add cheese to pot and cook, stirring constantly in a zigzag pattern to prevent cheese from balling up. Do this until cheese is just melted and creamy, but do not let boil.

Step 3

Stir in the Worcestershire sauce, dry mustard and ground nutmeg. Bring fondue to a simmer and cook, stirring, until thickened, about 5-8 minutes. Do not overcook or fondue will get stringy. Transfer to a fondue pot set over a flame.