Chorizo, paella and tortilla are staples at street food markets across the world... but not in Madrid! Here, street food is banned. Ainsley sets out to discover why this is so and comes across an underground movement planning to restore Spain’s favourite foods to their rightful place. On his mission to eat like a local, Ainsley visits Menu del Dia. Since the 1960s, this restaurant has served a government-regulated, three-course meal for only 10 euros. The set menu can include saffron rice with lobster or calamari braised in red wine. Next Ainsley hits up Madrid's famous tapas bars, trying salt cod fritters, garlic prawns, grilled sardines and delicious tostados. He cooks flambéed clams with cured ham, pineapple and chili salsa and sautéed leek and olive tapa with goat's cheese. Ainsley's week in Madrid ends at the city's first street food festival, where he cooks up a British-Spanish fusion dish - black pudding and chorizo clafouti.

• Ainsley Harriott