Goat Eggs.

It was a slip-of-the-tongue, but the DM rolled with it, and now it appears in multiple settings by him. Cheap price, has a fantastic shelf life, is filling enough to last most characters a day. Plus, the flavor of it (hehe) is often times chuckle worthy. "As you bite into the large, hard-boiled egg, you find a delicious and meaty crunch at the center. The crunch is not unlike the crunch of uncooked pasta."

Plus, a hatching goat egg could make a great distraction in the common room of an inn, or distract a posted guard for a moment or two.