Darvan Gloop (3.5e Equipment)
From D&D Wiki
Darvan Gloop is an Item sold at any store that sells exotic foods. Normally Darvan gloop costs 5 Gp and gets rid of all Fatigue points. It does have an unfortanate side-affect, though. If Darvan Gloop is not mixed with a small amount of water, the player that eats it shall burst into flames, which give 5d10 damage.