According to a late-morning tweet, tomorrow marks the debut of Shirohige Ramen-Ya, a San Francisco street-food ramen truck. The apparent proprietor -- somebody called Yatai -- hasn't returned SFoodie's call for details. But as far as we can make out on Shirohige Ramen-Ya's Twitter page, he'll be rolling up to the corner of Laguna and Hayes (opposite Suppenküche) in Hayes Valley. The menu lists three basic options: shio ramen, miso ramen, and shoyu ramen, all with optional toppings and sides. Regular hours are 11 a.m to 2 p.m., and 4 p.m. to 9 p.m., though it's not clear how long the truck will be around tomorrow. Updates when -- and if -- we get 'em.