In a bowl, combine Emmentaler and Gruyère, mixing well. Set aside.
Ina large saucepan, add garlic, wine and lemon juice. Bring to a simmer over medium heat.
Reduce heat to medium-low. Add cheese mixture in small amounts to saucepan, whisking after each addition, until cheese is melted.
In a small bowl, whisk together a little more wine and the cornstarch until smooth. Add to melted cheese, season with a pinch of white pepper and nutmeg, and stir until smooth. Transfer to a fondue pot and serve immediately.
Notes
Serve with cubed fresh baguette or crusty bread cubes, cornichons, broccoli, cauliflower, raw mushrooms or sliced apples.