Mbongiworks and Bonfire celebrate National Burger Day with Hellmann's Mayonnaise: The teams at Mbongiworks and its PR company, Bonfire Media, celebrated National Burger Day, on the last Sunday of May by keeping with the tradition of honouring the humble burger by creating a masterpiece or two that could easily be stand-up against the world’s best. Source: Media Update Submit … [Read more...] about Mbongiworks and Bonfire celebrate National Burger Day with Hellmann’s Mayonnaise