Swedish meatballs is an Earth ground meat delicacy that is something of an interstellar mystery.
Every spacefaring race is known to have a food identical to Swedish meatballs, be it Narn Breen or Centauri Prime's Roopo balls. Even races as diverse as the Abbai, Drazi and even the Gaim all have an equivalent dish, though the Centauri are the only ones with the audacity to claim they are the ones who invented it.
Some speculated that Jeffery Sinclair loved Swedish meatballs so much that he brought the knowledge of the recipe back a thousand years ago with him to the Minbari after turning into Valen. From there, it was likely that this recipe would eventually spread to many races in the galaxy and explain the pausible reason behind the mystery of this particular delicacy.
- Swedish meatballs at Scandinavian cooking.com