Sitting cross-legged on grass mats, sipping sake and eating sushi. This kind of Japanese dining experience is, well, foreign 'round these parts.Mark Snell and Piper Sullivan are changing that with Jin Gai International Foods LLC, a restaurant they recently opened at 805 S.E. Stephens St."I moved to Japan when I was young and I was a Japanese interpreter, and then I went into bar and restaurant design and international chef training," said Snell, who spent 17 years in Japan. "I've been back in American about three years now E I figured it was time to come back to the old …