At the heart of any great city is a thriving food culture, whether that’s to be found in vibrant street markets, high-end restaurants or backstreet cafés. In fact, sometimes the greatest delicacies are discovered in the most unexpected places – which is why a food tour with a local guide can help you lift the lid on the city’s best-kept secrets. From sampling street food in Tokyo to tasting London’s best fish and chips, here are 30 unmissable food tours in the world’s most exciting cities.