Preheat the oven to 200 °C.
Prepare the filling. Heat some olive oil in a pot, add the spinach, and let it wilt. Season with nutmeg, pepper, and salt. Remove the spinach from the heat and chop it very finely. Also chop the salmon and basil very finely so that you can easily fill the cannelloni. Set aside a few basil leaves.
Put the ricotta in a bowl and season with pepper and salt. Mix in the spinach, salmon, and basil. Place the ricotta mixture in a piping bag.
Make the creamy tomato sauce. Peel the onion and garlic and chop them finely. Heat some olive oil in a cooking pot and sauté the onion and garlic. Chop the tomatoes into small cubes and add them. Add the tomato paste, thyme, and bay leaf and let simmer for about 10 minutes. Pass the sauce through a sieve and add the cream. Season with pepper and salt.
Grease a baking dish with olive oil. Pipe the filling into the pasta tubes and place them in the baking dish. Pour the creamy tomato sauce over it. Make sure the tubes are completely covered; otherwise, they won't cook properly. Grate the fontina cheese over it.
Place the baking dish in the oven for 25 minutes.
Finish with a few basil leaves.
Tips
No extra tips needed, Just Enjoy!