Cook the spinach for 5 minutes in 1 teaspoon of oil, strain and put in a bowl. Mix with ricotta cheese.
Heat 2 teaspoons of oil in a pan, add pepper and fry for 2-3 minutes or until tender.
Mix with the spinach and ricotta cheese. Add basil, salt and pepper to the mixture.
Fill the cannelloni tubes with the stuffing and place on a greased baking dish.
Chop and liquidise the tomatoes. Heat the oil in a saucepan. Add the tomatoes, basil, salt and pepper and cook until thickened. Pour over the cannelloni. Sprinkle with cheese.