CAULIFLOWER PESTO GRATIN #lowglycemicindex #glutenfree really delicious. Oh cauliflower and pesto, they go so well together. I added a little bit of cheese but in small quantity, here goat cheese but you can use parmesan, gruyère... Or nothing! For my children and my husband who absolutely wanted a potato gratin, I made a mix of half potato / half cauliflower in another dish.