Step 1

In a large pot, heat olive oil over medium-high heat. Add onion, carrot and celery and season with salt and pepper. Cook, stirring occasionally, until vegetables are tender, about 10 minutes.

Step 2

Add tomato paste and cook, stirring constantly, until tomato paste begins to darken, about 4 minutes.

Step 3

Add tomatoes and heavy cream and season with salt and pepper. Bring to a boil, reduce heat and simmer until slightly thickened, about 10 minutes.

Step 4

Combine all the meatball ingredients in a large bowl and mix with your hands. Form into 1½" balls.

Step 5

Bring sauce to a simmer over low heat. Nestle meatballs in sauce, cover and simmer for 40 minutes. Top with Parmesan cheese.