In the episode “Walkabout”, G’Kar reveals than the Narn food “breen” is the same as Swedish meatballs from Earth, and that all sentient races have them.
It's an Earth food. They are called Swedish meatballs. It's a strange thing, but every sentient race has its own version of these Swedish meatballs! I suspect it's one of those great universal mysteries which will either never be explained, or which would drive you mad if you ever learned the truth.
The obvious answer to me is that this was from the Vorlons, given that they gave most every race telepaths, and apparently a belief that religious figures match them.
Could the Vorlons imparting their culinary preferences on younger races be the reason every sentient race has Swedish meatballs?