Owon eggs

Owon eggs are a food of undisclosed origin (though it may be presumed they are the product of an egg-laying creature called an owan). In 2365 Commander Riker purchased some at Starbase 73, but it is also uncertain if that is their world of origin.

Owon eggs have a brownish-purple shell and yellow yolks.

If Commander Riker's cooking demonstration is typical, humans find owon eggs to be rather unappetizing, but they are a delight to the Klingon palate. (TNG episode "Time Squared")