For chef Diomis Angelos of La Muna Restaurant in Davos, Switzerland, the heart and soul of Greek food can be found in a bottle. "[Olive oil] it is the golden thread intricately weaving the tapestry of my culinary heritage," he said. "I recall my yiayia (grandmother) in our village near Volos, [Greece], cooking Fasolakia Ladera [literally, "green beans of olive oil"] and using olive oil from our family's ancient grove. Yiayia would start by heating a generous amount of olive oil in a pot with the aroma of the heated oil signalling that a family feast was about to begin. She'd then add finely chopped onions and garlic, letting them soften and blend with the oil, before adding fresh green beans, potatoes and ripe tomatoes."

He's lost a wife because of flipping burgers but gained another one because of it. His own three children – Adam now taking the reins of the diner – were born into the smell of onion burgers and have diner blood running through their veins. And it's all thanks to the Oklahoma fried onion burger, which rose from the scarcity of the Great Depression, thus earning the quaint nickname of the "Depression Burger".

During America's Great Depression in the 1930s, hamburger meat was expensive. In the small community of El Reno, a dreamer named Ross Davis and his father opened the Hamburger Inn, scoring a prime location along the brand-new famed Route 66 highway right as the economy shattered.

"Well, obviously with the announcement, it wasn't like, 'Oh my God, it's a black referee'. It was more like, 'Oh, it's a black referee'," the former England striker, 60, recalled.

"I always found that when I played with him [as the referee] there was no real interaction.

"With some of the other referees, you could speak to them, have a little banter. And I think that the pressure he probably would have been under - to not have that kind of interaction with the other black players - must have been really intense, simply because of what people might say."

Rennie took charge of his final game in the Premier League on the last day of the 2007-08 season.

At 6ft 2in and a practitioner of kick-boxing and aikido, Rennie was an imposing figure who players soon learned would be more than comfortable standing his ground during an exchange.