Gremish was an ingredient used in cooking food.

In 2370, Gideon Seyetik served senior staff of Deep Space 9 a dinner of his creation made with a tumbler and a half of Gremish, Rumall stock, Kalo root, Waroon, Vulcan redspice, Humat pods, ice salt, and pepper. The recipe took years to perfect, and Chief O'Brien wanted a copy. (DS9: "Second Sight")