It's a mashed cornmeal, I think it's Italian. There's a recipe here ---> http://allrecipes.com/recipe/234933/how-to-make-perfect-polenta/ but it's usually sold in either the refrigerated pasta section or the produce section of grocery stores.
It's really good, and it's a thicker consistency than couscous. If I make this recipe, I'll substitute the couscous for polenta and report back.
RE: Recipe - Teriyaki Couscous