Wandering chef Keith Floyd reaches the south-western state of Kerala, where coconuts abound - and turn up in most dishes to take the edge off the tangiest spices. Recipes include vegetable curry with tamarind, coconut prawn curry with ginger, garlic, turmeric and onion, and brown mutton curry with a garam masala made from bay leaves, cloves, garlic and cinnamon, for which the meat is soaked for 24 hours in the inevitable coconut