"A lean ground beef works best for this recipe, inspired by my friend and cookbook author Rebecca Lang. If the small balls of fresh mozzarella are unavailable, sprinkle the layer with shredded mozzarella...."
INGREDIENTS
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1 large egg
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1/4 cup finely chopped onion
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1/4 cup seasoned breadcrumbs
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1 tablespoon ketchup
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1/2 teaspoon Worcestershire sauce
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Salt
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Freshly ground pepper
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1/2 pound ground beef
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4 small balls fresh mozzarella
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1 (8-ounce) can tomato sauce