Put a large deep pan of water on to boil. Peel, trim and wash the asparagus. Pack the asparagus into your pasta basket or equivalent. Salt the water, and plunge the asparagus into it when rapidly boiling. Cook for approximately 5 minutes. Melt the butter and put in a ramekin or suitable dish per person. Drain the asparagus, serve with the melted butter as a dip, and possibly lemon.