He tested his culinary skills and made, by his own admission, a 'champion' sandwich.
Perhaps Boris is looking for new hobbies to fill up his time when his term as Mayor comes to an end next month, after he was also proved he has green fingers at a new public garden in the town.
He spent an afternoon at fast food sandwich store Subway, greeted by head of brand Greg Madigan, Uxbridge store franchisee Chris Seymour and Greater London regional field manager Rusty Warren.
The Uxbridge and South Ruislip MP, whilst making his very own sub, said: "It's a champion sandwich. Its very good; the trick is slightly toasting and lots of vegetables."
"The Subway brand has great health messages which you should be telling everyone about."
The visit, on Friday April 22 saw Boris discuss key issues affecting the food service industry, the Subway brand's positive economic contribution to the UK, its leading partnership relationship with the government’s Public Health Responsibility Deal, and how the franchise is working with the local community to promote business opportunities in Uxbridge.
Boris’ visit was part of an ongoing programme of MP constituency engagement.
The Subway brand invites MPs to visit their local stores to meet the franchisee who owns and operates the store, the employees, and the ways that the brand leads the Quick Service Restaurant sector in its 'commitment to achieving public health policy objectives'.
Mr Madigan said: "It is important to inform MPs about both the Subway brand's economic contribution to local communities and the UK as a whole, as well as our industry leading health credentials which I hope he feeds into the government's upcoming childhood obesity strategy."
The public appearance came in the same week the Mayor was accused of racism after 'part-Kenyan' comments made about President Obama and activist dads were 'banned from being within 100m' of him after climbing his balcony .