Chef Tyler Florence's hunting-lodge-ish restaurant Wayfare Tavern hands over its used cooking oil to a biodiesel company.
But those barrels of used cooking oil in the back alley have ignited a grease war in Salt Lake County, Utah.
Banco Verde Vida (Green Life Bank) pays with its moeda verde (green currency) for recyclable materials such as plastic bottles, tins and used cooking oil.
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One innovative company, Grease Lightning, based in New York City, has been purchasing used cooking oil from local restaurants to convert into biodiesel fuel since 2011.
The line chefs chopping up eggplant, give him a nod as he walks over to another blue barrel, only this one is half full with used cooking oil.
The grain is one of the key starting links in the country's food chain, used to make cooking oil, tofu products and in feed for the burgeoning pig industry.
From Cabernet to Chardonnay, the seeds leftover from winemaking are used to make a cooking oil and skin-care products.
Most recycled cooking oil today is used to power diesel trucks or mixed with home heating fuel, a simpler conversion process.
And the price of one of its main products--palm oil, widely used for cooking in tropical Africa--also went haywire.
Coconuts are also used to make chutneys, pickles known as sambols and cooking oil.
The general mood is of concern, rather than outrage or panic, reports the BBC's John Sudworth in Shanghai, as the Chinese public are well used to food scandals, such as the use of oil scraped from sewers for cooking, and plasticiser found in baby formula.
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