Wikipedia Article About Trennette on Wikipedia Trennette is pasta made from a hollow cylinder which is folded a little, in order to make a triangle. A smaller variety of trenne. It is narrower in width than trenne and only 1¾ to 2 inches in length. Do not confuse trennette with trenette, which is a different type of pasta. Trenette is a ribbon pasta. If trennette is not available substitute mostaccioli, penne, trenne or ziti.