01 -
2 diced large shallots.
02 -
3 tablespoons of butter.
03 -
6 minced garlic cloves.
04 -
1 tablespoon of fresh rosemary.
05 -
1 tablespoon of fresh thyme.
06 -
3 tablespoons plain flour.
07 -
2 cups of full-fat milk.
08 -
1 cup of rich cream.
09 -
1½ teaspoons of sea salt.
10 -
1/8 teaspoon nutmeg.
11 -
1½ cups shredded gruyere cheese.
12 -
1½ cups grated parmesan cheese.
13 -
½ teaspoon of black or white pepper.
14 -
Heavy-duty aluminum foil.
15 -
5 to 6 medium-sized sweet potatoes.