Start boiling your potatoes in water with a bit of salt. Cook your potatoes for approximately 15 minutes depending on the size.
Now start peeling your asparagus, peel them twice to have nice and soft asparagus. Cut off the bottom of the asparagus. Lay the asparagus in a pan with cold water and some salt, then bring the pan to boil. When the water is boiling, turn off the heat, and add the lid to the pan. Keep it there for 15 minutes.
Start melting your butter in a pan on medium heat.