INGREDIENTS
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3 pounds yellow onions, cut into 1/8-inch pieces
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3 tablespoons unsalted butter
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1/2 teaspoon table salt, plus more as needed
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1 pinch sugar
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8 cups water , plus more as needed
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1 tablespoon all-purpose flour
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1 sprig fresh thyme
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1/4 cup dry white wine
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1 baguette , crusty
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8 ounces Gruyère cheese-I sliced it thick and placed it over the top of the crock…..the cheese melted mostly into the soup and a little off to the sides, but it created a thick, even layer this way.