Onion: 6
Butter: 50 grams
Olive Oil: 1 tablespoon(Optional)
Garlic: 2
beef stock: 1 ls
white wine: 150 milliliters(Optional)
flour: 1 tablespoon
Thyme: 1 teaspoon
bay leaf: 2
Salt: 1 teaspoon
Black Pepper: 1 teaspoon
baguette: 1
gruyere cheese: 150 grams