1. Cook the pasta sheets in salted boiling water for about 6 minutes, until they become soft.
2. Drain them on a cloth.
3. Heat the spinach to evaporate as much liquid as possible.
4. Then add 10 g of butter, salt, and pepper.
5. Let it simmer over low heat for a few minutes, stirring.
6. Off the heat, add the egg yolks, ricotta, 50 g of Parmesan cheese, basil, and nutmeg.
7. Mix well.
8. Preheat the oven to 180°C (350°F, gas mark 4).
9. Heat 1 tablespoon of olive oil in a sauté pan. Sauté the chopped shallot, then add the chopped peeled tomatoes and tarragon. Season with salt and pepper.
10. Let it simmer for 5 minutes over low heat.
11. Fill the pasta rectangles with the spinach filling, roll them into cylinders, and place them in a buttered baking dish covered with 2/3 of the tomato sauce.
12. Cover with the remaining tomato sauce, cream, and remaining Parmesan cheese.
13. Bake for 15 minutes, optionally broil for 2 minutes to brown the top before serving.