Vietnam is famous for its street food; because it is less regulated than in other countries, many experts feel it is true street food. In many countries, street food is often sold from an open window or wall in a storefront or a stall. In Vietnam, however, vendors roam the streets with their offerings. Typically offering only one item, they have spent their life and career refining and perfecting the perfect roasted pork belly, the fantastic bowl of pho, or the most flavorful rich coffee. Common cooking techniques of Vietnamese street food are coal grilling, deep-frying, and steaming.