When Scott Norton and Mark Ramadan were undergraduates at Brown university in Rhode Island a decade ago, they were horrified not by the 2008 financial crisis but by Heinz tomato ketchup. The bright red sauce was so common in shops and kitchens round the world that it seemed it would be there forever. “At the centre of supermarkets were all these classic American brands that hadn’t evolved in 70 years,” recalls Mr Norton.

As they talked to their student friends, they realised that none of them wanted bland, mass market products shipped from factories by huge corporations. So they started to mix their own organic ketchup in an off-campus apartment. On graduation, they founded a company and, having no origin story with resonance, invented a joke one. They named it after a mythical Victorian called Sir Kensington, a monocled adventurer who had “advised the British East India company in the acquisition of spices”.

The pair are now 31, at the heart of a millennial generation that has come of age, transforming business not only in the US but round the world. In April, their company was acquired by Unilever, the British-Dutch group that had fended off a takeover by Kraft Heinz. Their ketchup, once a student jape, has just gone on shelves in Walmart and Target. “Sir Kensington’s is the playbook for reaching millennials,” says Richard Hartell, president of strategy and transformation at Publicis Media.