Alternatives to touch screen interactions on Kitchen Ops UIs

I'm designing a Kitchen Ops app that will be used by staff in the kitchen of a restaurant. The client already plans on using iPad's for this, and each of the staff will have a mounted device next to them displaying the meals they need to prepare.

Given the nature of cooking, food preparation and the kitchen environment in general, i'm expecting other factors like greasy, oily or wet hands when touching the displays to interact with the UI. I'm exploring how to overcome potential problems that maybe come up related to these. or what other ways could the UI or the devices be adjusted to overcome this?