Skillet Burgers with Tomato Sauce
Ingredients:
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1 ½ pounds ground beef
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2 (8 ounce) cans tomato sauce, divided
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1 large egg
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1 teaspoon salt
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¼ teaspoon ground black pepper
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6 thin slices onion
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1 tablespoon olive oil, or as needed
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6 thin slices lemon
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1 tablespoon Worcestershire sauce
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1 tablespoon white sugar
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1 teaspoon chili powder
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½ teaspoon mustard