"For the best flavor, make the soup a day ahead. Prep time does not include making this a day ahead...."
INGREDIENTS
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2 tablespoons butter
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4 large Spanish onions, quartered and cut into 1/4-inch slices
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1/2 teaspoon salt
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1/4 cup flour
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9 cups beef broth
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3/4 cup red wine
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3 tablespoons brandy
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1 bay leaf
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1/2 teaspoon dried thyme
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1/2 teaspoon black pepper
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1 tablespoon olive oil
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1/2 teaspoon garlic powder
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4 slices French bread, 1/2-inch thick
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4 -6 ounces gruyere cheese, shredded (or mozzarella)