01 -
Heat olive oil over medium heat. Saute onion and garlic until fragrant and translucent, about 2 minutes. Add tomatoes, tomato paste, dried oregano, salt, sugar, and black pepper. Simmer for 20 minutes. Turn off heat, then puree with a hand blender until smooth. Add basil and cook for 2 more minutes, then set aside.
02 -
Chop spinach and wilt it over low heat. Transfer spinach to a mixing bowl and combine it with ricotta cheese, egg, parmesan cheese, mozzarella cheese, nutmeg, salt, and pepper until thoroughly mixed. Transfer the filling into a piping bag.
03 -
Preheat oven to 180℃. Spread 1 cup of sauce on the base of a baking dish. Fill each cannelloni with the prepared filling and arrange them in the baking dish. Pour remaining sauce over the cannelloni, then top with mozzarella and parmesan cheese. Cover with foil and bake for 30 minutes.
04 -
After 30 minutes, remove the foil. Bake uncovered for an additional 10 minutes, or until the cheese is bubbling and golden.
05 -
Garnish the baked cannelloni with fresh basil and serve immediately.