"It makes it taste like it's been simmering all day...."
INGREDIENTS
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1 medium yellow onion
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3 cloves garlic
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1 tablespoon olive oil
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1 pound lean ground beef
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1 1/2 teaspoons kosher salt, divided, plus more for the pasta water
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1/2 teaspoon dried oregano
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1/4 teaspoon freshly ground black pepper
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1/4 teaspoon red pepper flakes (optional)
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1 (28-ounce) can crushed tomatoes
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1 pound dried spaghetti
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2 teaspoons balsamic vinegar
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Freshly grated Parmesan cheese, for serving