Ingredients
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3 tablespoons butter
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1 tablespoon olive oil
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1 large onion, thinly sliced
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2 cloves garlic, minced
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3 tablespoons all-purpose flour
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2 cups beef broth (or chicken broth)
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½ cup heavy cream or whole milk
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1 teaspoon Worcestershire sauce
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Salt and black pepper, to taste
Optional but excellent:
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A pinch of thyme
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A splash of soy sauce for extra depth