"In this genius slow-cooker soup recipe, two types of onions are caramelized for hours before adding a sherry-spiked broth. For a bistro-worthy presentation, ladle the soup into ovenproof crocks, top with the bread and cheese and broil...."
INGREDIENTS
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2 tablespoons butter, cut into 8 pieces
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2 tablespoons extra-virgin olive oil
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8 sprigs fresh thyme
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4 cloves garlic, smashed
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1 bay leaf
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2 pounds yellow onions, halved and sliced (see Tip)
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2 pounds red onions, halved and sliced
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1 teaspoon salt
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3/4 teaspoon ground pepper
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4 cups low-sodium beef broth
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1/4 cup dry sherry
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8 diagonal slices baguette (1/2-inch-thick), toasted
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1 cup shredded Gruyère or Swiss cheese