At its most basic, drop in at Pelgrom to enjoy a meal in a 15th-century cellar. The labyrinth of long, brick rooms are lit almost entirely by candlelight. It takes a while for your eyes to adjust - and you may never see your food properly - but the ambiance is unique and fun for both tourists and locals.
Pelgrom offers a basic menu with familiar brasserie food (croque monsieur, pasta bolognaise) at fairly reasonable prices, given its location and character, and quite a good beer list.
Add to your experience by enjoying a visit at the private museum based on the upper floors of the 16th-century house. Open on weekends, its only €3 for this diverting tour amongst the tiny rooms where eight people once lived together. Although the residents are long gone, there are a few live animals on these upper floors, just as there would have been all those years ago.
But back to the cellars: one area is called De Grootte Ganz Medieval Restaurant, where you eat with wooden spoons (and your hands), the waiters are in medieval costume, and period music plays in the background.
The venue can also be hired for private events, starting with a standard buffet and working up to historical banquets. These are based in a particular century, and you get to choose between the wooden spoons and normal cutlery. The highest-end banquet is the "culinary walk through Flanders", where each course hearkens from a different Flemish town - for example, Gent's waterzooi and Brussels' waffles make appearances on the menu.
Top off any of those options by hiring a mediaeval magician, musician or dancer to join your festivity. It's all a bit silly, but in a charming way.