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1
Place bacon in processor. Using on/off turns, grind to coarse paste. Transfer to large bowl. Using garlic press, squeeze in garlic. Gently mix in beef and all remaining ingredients. Let stand 15 minutes.
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2
Line large rimmed baking sheet with plastic wrap. Using moistened hands and scant 2 tablespoonfuls for each, roll meat mixture into 11/2-inch meatballs. Arrange meatballs on sheet. DO AHEAD:
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3
Cover with plastic wrap; chill.
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4
Puree tomatoes with juice and garlic in batches in blender until smooth.
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5
Cook bacon in large pot over medium heat until crisp; transfer bacon to plate.
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6
Add 1 tablespoon oil to drippings in pot and heat over medium heat. Add half of meatballs. Cook until brown on all sides, turning carefully with small metal spatula, about 9 minutes. Transfer meatballs to baking sheet. Add more oil to pot if needed and repeat with remaining meatballs.
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7
Increase heat to medium-high. Add onions and crushed red pepper to pot.
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8
Saute until golden, about 6 minutes. Add wine; boil until reduced by half, stirring up browned bits, about 8 minutes. Add tomato puree and marjoram. Boil until sauce thickens slightly, stirring occasionally, about 8 minutes. Season with salt and pepper. Mix bacon into sauce. Add meatballs; bring to simmer. Reduce heat to low; cover and simmer until meatballs are heated through and tender, 10 to 15 minutes. Season sauce with salt and pepper.
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9
Meanwhile, cook spaghetti in pot of boiling salted water until just tender but still firm to bite, stirring occasionally. Drain; transfer to large bowl. Toss with 2 tablespoons oil and marjoram, adding more oil to moisten, if desired. Divide spaghetti among bowls. Top with meatballs and sauce. Sprinkle with cheese and serve, passing additional cheese separately.
