1. Detach the bouquets of Cauliflower. Peel the potatoes and cut into 2 to 3 cm cubes.
2. Put the vegetables in the Steamed Steamer and steam or put in a saucepan and cover with water and boil.
3. Meanwhile prepare the béchamel
4. Mix the cornstarch with some of the cold milk.
5. Boil the rest of the milk in the microwave at maximum power (time depending on the oven power)
6. Pour the mix milk / corn starch into the boiling milk stir
7. Bake 1 min maximum power (put back if necessary)
8. Season with salt, pepper and nutmeg.
9. Add oil if necessary
10. In a gratin dish arrange the vegetables.
11. Nape the bechamel vegetables.
12. Spread the cheese grated.
13. Put in the oven th7 or on grill position, according to the technical possibilities.