When you don't have much money or time and need something to eat then street food is perfect. This is fried egg with some vegetables and processed meat wrapped in some thin pita-like bread. The outdoor cooks work for 12 hours or longer a day in any weather. I guess the profit margins aren't great when it costs 17p. The food is exposed to all the air pollution in Tianjin and it could be more hygienic. But I haven't been food-poisoned yet - bonus!