1 block of Lurpak Butter (50g)
1 onion, finely chopped
2 tablespoons of flour
½ cup of chicken broth
½ cup of cream
1 cup of shredded gruyere cheese
1 teaspoon of fresh thyme, minced.
1.5 kg potatoes
Salt and pepper, to taste.
½ cup of shredded parmesan cheese