Chop the Veggies: Finely chop the onion, carrot, and celery. You can also pulse them in a food processor until very small if you prefer a smoother sauce.
1 small yellow onion, 1 medium carrot, 1 celery stalk
Sauté the Vegetables: Heat the butter and olive oil in a large skillet over medium heat. Add the onion, carrot, and celery. Cook until soft and fragrant, about 5–6 minutes.
2 tablespoons unsalted butter, 1 tablespoon olive oil
Cook the Meat: Add the ground beef to the skillet. Break it apart with a wooden spoon and cook until browned all over, about 5 minutes.
1 pound ground beef
Add the Sauce Ingredients: Stir in the blended tomatoes, chicken stock, nutmeg, salt, and black pepper. Mix well to combine everything.
1 ½ cups canned whole San Marzano tomatoes, ½ cup low-sodium chicken stock, ⅛ teaspoon ground nutmeg, ½ teaspoon salt, ¼ teaspoon black pepper
Simmer and Thicken: Let the sauce simmer for 8–10 minutes, stirring occasionally, until slightly thickened and the flavors have melded together.
Serve and Enjoy: Spoon the sauce over hot cooked pasta. Sprinkle with Parmesan cheese if you’d like, and serve right away.
Cooked pasta, Grated Parmesan cheese