Firespice was a type of spice regarded for its pungent taste. Newcomers to the restaurant Pepper's Pax on the planet Darlyn Boda were required to eat a mouthful of firespice vegetable pods to prove their fortitude. Those who failed the test were rudely removed from the premises.
Sources
Rough and Tundra on Wizards.com (backup link) (original site is defunct)