Combine Emmentaler and Le Gruyère with flour, stir and set aside (either in medium bowl or in a plastic bag). Rub the inside of the fondue pot with cut garlic clove. Pour wine into pot and heat over medium heat until warm. Add lemon juice. Add cheese by handful, stirring constantly with a wooden spoon until melted and cheese-wine mixture has the consistency of a creamy sauce. Add pepper and nutmeg (you can add cayenne or other spices too). Bring to boil. Remove pot and put on lighted burner on table. Adjust flame of burner so fondue continues bubbling lightly or bring pot to table and set on a trivet. Serve each guest a handful of bread cubes. Spear fondue fork through bread cubes. Dunk and stir well to cover bread cube with cheese mixture.
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