Sushi originated as underwater tumbleweeds that gathered seaweed and fresh fish as they rolled forebodingly between dueling mermen. Relive the showdown at the O.K. Coral with today's Groupon: for $15, you get $30 worth of sushi, dim sum, and assorted Asian fare at Imperia.

Head sushi chef Takuya Matsumoto emblazons Imperia's upscale Japanese menu with personal flair that amassed seven Austin Chronicle reader accolades from 2008 to 2009. End a jowel-quiveringly intense staring contest with house edamame bedecked with lemon essence ($4.95) or skewers of sea bass kushiyaki served with peanut sauce ($12.95). Nigiri and sashimi rice satchels can be stuffed with schools of bluefin tuna ($9 for three; $13 for five), and the 4138 roll caps a tempura shrimp roll with tuna and salmon ($14.95). Inside the stylish urban lounge, pendant lights illuminate a serpentine marble bar winding past Asian décor, where omakase meals, creatively orchestrated by the chef, can also be ordered and shoveled ($49.95 for three courses).