One of the specialties from the Oyama region of Kanagawa Prefecture is their tofu, in part because it's made using pure spring water from Mt. Oyama itself. Owing to this, the area hosts an annual tofu festival, where you can learn more about this staple food - and even try making it for yourself, if you wish!
A couple of the quirkier attractions at the festival include a tofu speed eating competition, and the chance to watch tofu being made in a pot which is four meters in diameter. Talk about cooking to feed a crowd!