iDevices wants to make sure your every barbecue is a sucess, so they've released theiDevices Connected app for the Apple Watch.
When you set up your iDevices product you can select the temperature you want your food to reach. When it's done it will send an alert via bluetooth to your watch; saving you time watching over your stove or grill. The app can also show you a graph with the complete details of temperature progression while you were cooking.
You can download iDevices Connected for free on the App Store and get your hands on aniGrill or iDevices Kitchen Thermometer on the iDevices website.