INGREDIENTS
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1 pound ground beef
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1 teaspoon olive oil
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1 medium onion, chopped small
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1 carrot, peeled and chopped small
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8- to 10-ounce package mushrooms (button or baby bella), sliced thinly
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2 cloves garlic,
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8-ounce can tomato sauce
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1/4 cup ketchup
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1-2 tablespoons cider vinegar
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1/2 tablespoon Worcestershire sauce
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1/2 tablespoon sugar (optional)
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1 teaspoon salt
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1/8 teaspoon black pepper
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8 hamburger buns