This Danish restaurant is battling against food wastes by serving up dishes made from ingredients that grocery stores throw out.

Food waste across the world has skyrocketed in recent years. For instance, food waste in the US amounted to more than 103 million tons (81.4 billion pounds) in 2018, according to the Environmental Protection Agency (EPA).

And a huge amount of this food waste is edible, though picky eaters discard it.

'Ugly' fruits, curved vegetables, offcuts of meat or fish, and other less-than-perfect produce don't meet specific consumer requirements. And so, retailers and restaurants cast them aside.

But one restaurant in Copenhagen is combating this food waste issue.

'Rub & Stub' opened after a group of environmentally-conscious friends decided to do something about the huge amount of food waste grocery stores and other retailers throw out.

Volunteers at the restaurant cycle around the city each morning to collect food that stores will not sell that day.

They'll then bring the items, which are still fresh, to the restaurant, where the chef will turn them into fine cuisine.

Some examples of the perfectly edible ingredients the restaurant uses include misshapen bananas, tomatoes that have a greenness to them, and other items close to their best before date.

The menu at Rub and Stub also changes on a day-by-day basis, depending on the surplus ingredients available that day.

This quirky restaurant has more than 100 volunteers who help manage the running of the kitchen, bar and service. And there are only two members of employed staff: the chef and project manager.

And every profit the restaurant makes, the management donates it into charity.