Spread the sauce on the bottom of an oven dish. Arrange the frozen cannelloni on a base of sauce and cover everything with more sauce.
Cover with grated cheese and bake for 20 minutes at 180° C.
Place the gratin as it is on a dinner plate or dress sauce and cannelloni nicely on a warm plate.
Tip: for a main course, we recommend serving 6 cannelloni and +/- 200 gr of sauce.