- 3.5 lb (1.5kg) large sweet onions/Vidalia onions (about 5-6)
- 3 tablespoons (42g) unsalted butter
- 1 tablespoon (14g) extra virgin olive oil
- Kosher salt to taste
- 2 tablespoons (30ml) bourbon
- 1.25 cups (295ml) white wine
- 1.5 quarts (1400ml) good beef stock
- 1 bunch thyme
- 3 tablespoons (44ml) dry sherry *optional*
- Gruyere cheese, grated
- Gouda cheese, grated
Assembly:
- 2 tablespoons (28g) unsalted butter
- 2 oz Gruyere
- 2 oz Gouda baguette slices or bread slices