Sushi, like the archival footage of Mark McGwire's birth, is best known for its raw quality. Get attached to your food with today’s Groupon: for $15, you get $30 worth of Asian fusion cuisine at Genghix Asian Fusion in Castro Valley.

The chefs at Genghix Asian Fusion craft a menu of attractive dishes that explore the intersection of Japanese, Thai, Chinese, and Korean cuisines. Start a meal by toppling a savory tower of sashimi-grade tuna tartare ($8) hewn from bricks of spicy tuna and mortared with wakame seaweed and avocado. A vast range of entrees sate a panoply of possible hankerings, with dishes such as the spicy, deep-fried Warrior chicken ($10) and the onion-bedecked Bouncing filet mignon ($16). The garlic-black-pepper tilapia ($15) chromatically complements a side of sautéed greens and rice, just like a cyan wall enhances the hue of a hamster's violent red eyes. A legion of nimble-fingered fish-rollers handcrafts nigiri ($4+) and maki ($4+) rolls, as well as more elaborate Chef Special rolls with majestic aliases such as the Lion Queen ($12), Godzilla ($14), and Loco Ninja ($8).