Ingredients
- 3 tablespoons (45g) unsalted butter, plus more for greasing baking dish
- 3 large Spanish onions (about 2 1/2 pounds; 1kg), thinly sliced
- 1 teaspoon sugar
- 1 teaspoon kosher salt
- 3 medium cloves garlic, minced
- 2 teaspoons finely chopped fresh thyme leaves
- 1/4 cup (60ml) dry sherry
- 1/2 cup (120ml) dry white wine
- 1 large Italian or French bread loaf (about 1 pound; 450g), cut into 1-inch cubes
- 6 large eggs
- 3 1/2 cups (830ml) half and half or whole milk
- 1 1/2 tablespoons (22ml) smooth Dijon mustard
- 1 tablespoon (15ml) Worcestershire sauce
- 1 teaspoon (5ml) fish sauce (optional)
- 1/2 teaspoon kosher salt
- 1 teaspoon freshly ground black pepper
- 1 1/2 cups (8 ounces) grated Gruyère cheese
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