Gremish is 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")