Two weeks ago, I was walking towards London Bridge after work through Borough Market. People in the pubs spilled out on to the pavements to make the most of the warm air. I’d stopped in a pub on the way home with a couple of friends and we were in no hurry. Then I saw Porteña (tag line: Argentinian Street Food), and I was overwhelmed with memories (it doesn’t take a lot). We perched on one of the stools outside, ordered half a dozen empanadas (dos de carne, dos de pollo y dos de jamon y queso), a bottle of Malbec (Quilmes was on offer – obvio) and I was back in Buenos Aires…