INGREDIENTS
1/4 cup
olive oil
1
large yellow onion, finely chopped
4 cloves
garlic, finely chopped
Kosher salt and freshly ground pepper
2 tbsp
tomato paste
1 28 ounce can
whole peeled tomatoes, packed in juice
1 28 ounce can
tomato purée or sauce
3/4 tsp
red pepper flakes (optional)
16
ounces/1 pound ricotta
1/2 cup
heavy cream
1/2 cup
finely grated Parmesan or Pecorino, plus more for grating on top
1 lb
ziti, rigatoni, penne, manicotti or other short, tubelike pasta
1 lb
fresh mozzarella, cut into 1/2-inch pieces