CLOSED Minnesota's biggest Cantonese restaurant and dim sum palace JunBo occupies the massive old Chi Chi's space just north of 494 and spaciously seats 400. Through these vast fields dim sum carts wheel every day, carts innumerably packed with dishes uncountable. Or, it seems that way anyway, as the bounty descends: bowls of whole Manila clams, steamed till their brown shells fan open, then drizzled with perky black bean sauce; dumplings of astounding variety. Egg rolls are as thin as magic wands, filled with long strips of greens and little morsels of pork. And then there are all the dozens of classics, including pork buns, congee, tripe, pork ribs, custard tarts, crab-claw balls, turnip cakes, mango pudding that tastes like jelly beans, coconut pudding that tastes like silken sugar, and more, more, more. The dim sum rolls from 11 a.m. to 3:00 p.m. and 5:00 p.m. to 9:00 p.m., but is also available from an a la carte menu; please note that the restaurant is open every single day, from 11 a.m. till 1:00 a.m. usually, and to a gleefully hangover preventing 3:00 a.m. on Fridays and Saturdays.