Peel the asparagus, cutting off the woody end pieces. Cook the asparagus in salted water with a pinch of sugar and a teaspoon of butter for 20 minutes. Take out and drain. Sauté shallot cubes in the remaining hot butter. Mix with white wine, mustard, grated Parmesan, cream, salt and pepper. Place the asparagus in an ovenproof dish and pour the sauce over them. Bake under the preheated grill for 5 minutes until a golden-yellow crust has formed (approx. 45 minutes)