"Play around with the ingredients for different flavors - use seasoned instead of plain breadcrumbs, use another kind of hard cheese (halve the salt if using pecorino) or replace the oregano with hot pepper flakes...."
INGREDIENTS
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1 medium onion, finely chopped and divided
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1/2 cup (60g) plain dried bread crumbs
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1/3 cup (30g) grated parmesan cheese
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1/2 teaspoon dried oregano
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1/4 teaspoon black pepper
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2 teaspoons salt, divided
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1/2 cup (120ml) whole milk
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1 pound (500g) mixed ground meat (for example pork, beef and veal or just beef)
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1 large egg, lightly beaten
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1 tablespoon olive oil
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1 medium carrot, finely chopped
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1/2 celery stalk, finely chopped
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2 3/4 cups (700g) tomato puree
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2 cups (500 ml) water