"Pureed caramelized onions are the key to this rich golden-brown gravy that everyone - meat-eaters and vegetarians alike - will be sure to gobble up...."
INGREDIENTS
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2 tablespoons olive oil
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1 large yellow onion, halved and sliced thin
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1 teaspoon sugar
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4 cups low-sodium vegetable broth*, divided
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3 tablespoons butter
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1/4 cup all-purpose flour
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1/2 teaspoon salt plus more to taste
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1/8 teaspoon freshly ground black pepper plus more to taste
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1 teaspoon fresh chopped thyme or 1/2 teaspoon dried thyme
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1 tablespoon Tamari or soy sauce
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1 bay leaf
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1 teaspoon balsamic vinegar