A tourist tries a tuna (prickly pear) during an Eat Mexico tour at a market in Mexico City October 18, 2013. Founded in 2010, Eat Mexico is the only culinary tour operator that focuses exclusively on street food and markets providing an opportunity for tourists to approach dishes ranging from traditional tamales to tacos. Organised in small groups, the tourists have the chance to learn more from local culture and culinary traditions in the city, according to organisers. REUTERS/Tomas Bravo (MEXICO - Tags: TRAVEL FOOD)