Heat a Dutch oven or deep skillet over medium-high heat. Add the oil.
Add the ground beef, breaking it up with a spoon. Cook until browned, about 3-5 minutes.
Add chopped onion, minced garlic, 3/4 teaspoon salt, Italian seasoning, and crushed red pepper. Cook for another 5 minutes until the onions are softened.
Stir in the tomato paste and cook for 2-3 minutes to enhance its flavor.
Add the tomato sauce, water, and remaining salt. Stir well and bring to a boil.
Add dry pasta and reduce heat to a simmer. Cook for about 12 minutes, stirring occasionally, until the pasta is tender.
If using mozzarella cheese, sprinkle it over the top, cover, and let it sit for a few minutes to melt.
Serve hot, garnished as desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat gently on the stove.