Don't knock it until you've tried it, McDonald's Japan is launching a McShake in a Purple Sweet Potato flavor.

Purple sweet potatoes have been an established dessert in Asian cultures for years so it makes absolute sense that the the popular dessert ingredient would be turned into a milkshake flavor. Enter McDonald's Japan who will be turning the sweet, purple starch into a McShake.

McDonald's is set to release the Murasaki Imo, which translates into purple sweet potato, milkshake starting Sept. 10. There's no word yet on how it tastes, or if it'll even have real purple potatoes in it. However, it's definitely piqued our interests. The McShake will be available for a limited time at all participating McDonald's Japan locations.

H/T Kotaku