I am reading a scan of a short Icelandic tale.
Clench your teeth and suck air through the disastemal gaps, drawing any bits of pulp or gristle remaining from your last meal into your mouth. It can make any of several distinctive noises, that are culturally significant in some times and places, depending on how you hold your lips and tongue.
If you want to do it silently, place your tongue in front of at least two upper teeth, and suck any wayward asparagus from between them. If you can figure out how to do it without using your tongue you can do it on your lower teeth, too, but careful you don’t rupture blood vessels in your lips.
