INGREDIENTS
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2 tablespoons extra-virgin olive oil
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5 cloves minced garlic
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8 cups thinly sliced onions
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Gray salt
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1 tablespoon fresh thyme leaves, chopped
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1/4 cup sherry vinegar
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1 1/2 cups dark beer (recommended: Guinness)
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6 cups beef stock
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6 slices country bread cut 1/2-inch thick, toasted
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1/2 pound Irish Cheddar, sliced thin