I first learned of reimen (冷麺) while living in Japan (it's a Morioka specialty), and therefore mistook it for a Japanese dish. But it's actually a cold Korean soup. Alas, I don't have a recipe for it, I've either used kit dinners from Japan (brought back with me from trips and soon missed) or strained sweet chili spring roll dipping sauce and added kimchee for spice. I know that's not how you're supposed to make it, but when in 'desperation'... And it works, after a fashion.
So, reimen. Cold rice noodles in a spice broth with kimchee, a slice of beef, cucumbers, a boiled egg and fruit (I've had it with watermelon and nashi - Japanese pear). If you've never had it before, I highly recommend it. And if anyone knows the proper recipe for it (I've looked online before without luck), please send it my way.