Ingredients
- 1 1/2 pounds onions (2 to 3 medium onions), thinly sliced
- 1 teaspoon sugar
- 3 teaspoons kosher salt
- 3 tablespoons clarified butter*
- 1 tablespoon sweet sherry
- 1 large Italian or French bread loaf, crusts removed, cut into 5 by 1-inch pieces
- 6 eggs
- 2 cups heavy cream
- 1 tablespoon grainy mustard
- 1 teaspoon finely chopped thyme
- 1 teaspoon freshly ground black pepper
- 2 cups grated Gruyere cheese
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