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In a large skillet, heat the oil over medium-low
heat. Add the onions and cook until soft, about 5
minutes. Stir in the garlic and cook for 30
seconds. Stir in the beef and cook until browned;
season with salt and pepper. Stir in the tomato
paste, then add the tomatoes and mustard. Let the
mixture bubble gently until it is slightly
thickened, about 2 minutes.
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