A couple of weeks ago I was invited to a burrito master class at Tortilla, a chain of Mexican burrito restaurants in London. I wasn’t feeling too well a couple of days leading up to the event and I had been to the doctors that morning and was told I had a kidney infection. Lovely. Still, I went partly because I didn’t want to let anyone down and partly because I love a good burrito. We arrived at the Market Place branch just off Oxford Street and joined the group waiting downstairs. The evening started with a talk from the founder Brandon Stephens and the Brazillian head chef Bruno Pires. I was really happy to see that Brandon is obviously an avid burrito fan and his enthusiasm really won me over. After the talk, they brought a load of ingredients for guacamole and we had a go at making our own. All of the ingredients were there for us to use – avocado, green chillies, garlic, coriander, lime, tomatoes, salt and pepper and we could …