In a bowl, combine the cheeses and put aside.
Rub the inside of a large saucepan or casserole dish, with garlic and place the saucepan on low-medium heat. Add the wine, heat until warm, but not boiling!
Add the cheese by handfuls, stirring constantly with a wooden spoon until melted and cheese-wine mixture has the consistency of a creamy sauce.
Mix the cornstarch and water in a small bowl and then stir into the cheese. As the mixture thickens, let the mixture come to the boil once, before you remove pot and place it on a lighted burner on table. Adjust flame of the burner so the fondue continues bubbling lightly.
Place baskets of bread cubes onto the table. Take a handful of the bread cubes, sprinkle with black and spear fondue fork through bread cubes. Dunk and stir well to bottom of pot.
Serve with white wine or Kirsch to prevent getting that heavy cheese feeling!
Other serving suggestions: cherry tomatoes, grapes, sliced ham and kielbasa.