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1
Heat oil in a 5- to 6-quart heavy pot over moderately high heat until hot but not smoking, then saute onion, stirring occasionally, until golden, about 6 minutes. Add garlic and oregano and saute, stirring, 1 minute. Add tomatoes with reserved juice, tomato paste, bay leaf, and salt and simmer, uncovered, stirring occasionally, until thickened, 30 to 35 minutes. Discard bay leaf.
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2
Stir together bread crumbs and milk in a large bowl and let stand 10 minutes. Add meat, garlic, cheese, egg, parsley, salt, and pepper and blend with your hands until just combined well (do not overmix). Form level 1/2-teaspoon portions into meatballs (you should have about 135).
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3
Heat oil in a 10-inch heavy skillet over moderate heat until hot but not smoking, then fry meatballs in 5 batches (do not crowd), turning occasionally, until browned well and cooked through, about 2 minutes per batch. Transfer as browned to paper towels using a slotted spoon.
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4
Stir together all filling ingredients until combined well.
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5
Put oven rack in middle position and preheat oven to 425u00b0F.
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6
Cook pasta in a 6- to 8-quart pot of boiling salted water, uncovered, until al dente. Drain in a colander, then rinse under cold water and drain again.
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7
Spread 2 cups sauce in a 13- by 9-inch or other 3-quart glass or ceramic baking dish and arrange one third of fettuccine over sauce, then top with all of meatballs. Make another layer each of 2 cups sauce and one third of fettuccine, then spread with all of filling. Top with remaining fettuccine, then remaining sauce. Sprinkle evenly with mozzarella.
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8
Bake, loosely covered with foil, 10 minutes. Remove foil and bake until sauce is bubbling and cheese is golden, about 20 minutes more. Transfer to a rack and cool, about 20 minutes.
