Peel the asparagus well, cut off the woody ends and place the asparagus dripping wet in the Ultra - Plus from Tupper (I took the 3 liter pot). Sprinkle salt and sugar on top and pour the melted butter on top. Preheat the oven to 180 degrees with a fan oven and cook the asparagus in it for 40 to 45 minutes (you might want to try a knife in between).
A tasty jacket potato, doused with the liquid that has accumulated in the Ultra, and a few ham rolls are enough.