Prepare the sauce: Sauté onion and half garlic in olive oil for 5 minutes. Add crushed tomatoes, season with salt and pepper, and simmer for 10 minutes.
STEP 3
Prepare the filling: Sauté remaining garlic in olive oil, add spinach, season, and cook for 3-4 minutes.
STEP 4
Mix spinach with goat cheese and egg. Season to taste.
STEP 5
Boil salted water and cook conchiglioni 5 minutes less than package specifies. Drain the pasta.
STEP 6
Preheat oven to 180°C. Spread tomato sauce in a baking dish, fill conchiglioni with filling, place on sauce, and bake for 20-25 minutes. Top with grated pecorino before serving.