New York (CNN Business) Incogmeato, Kellogg's new line of plant-based protein, is coming to Pizza Hut.

Starting on Wednesday, the pizza chain will serve a new vegetable pizza topped with Incogmeato's meatless Italian sausage at one location in Phoenix, Arizona. The test will last for a limited time. Pizza Hut will sell the pie in a new, round pizza box, which it is also testing at the Phoenix location.

Taken together, the Garden Specialty Pizza and the new packaging may attract customers who are concerned about the environment. Plant-based proteins use far less water and are responsible for fewer emissions than their animal protein counterparts. And the round pizza boxes use less packaging than traditional square boxes.

It took about two years to develop the round box.

It took two years to develop the box, said Nicolas Burquier, chief customer and operations officer for Pizza Hut. He called the container "the most innovative packaging we've rolled out to date."

While Pizza Hut may be leading the pack when it comes to pizza boxes, it's following a more established pattern by testing out a product that features plant-based protein.