Boil it, bag it, wait, and feast.

Who said a slow cooker had to be plugged in? The Wonderbag is a portable, non-electric slow-cooker that continues to cook food using residual heat for up to 12 hours. Here’s how it works: First, prep your food just as you would for regular stove-top cooking and bring it to a boil. Then take it off the stove and bag it up inside the Wonderbag and seal it inside for up to 12 hours. It’s an age-old method of cooking made modern by a South African non-profit that helps individuals around the world save time, reduce fuel consumption and cut down on air pollution. When you buy a Wonderbag, they’ll donate one to a family in need.

Bring it on your next camping trip or use it at home for an environmentally-friendly cooking method that saves money. Try out some of these hearty stew recipes! The Wonderbag also works well for yogurt-making and bread proofing. Bonus: It keeps food cool, too!