Minamoto Sushi and Japanese Restaurant. The only authentic Japanese cuisine in Concord, and the only Japanese Owned Japanese Restaurant, in all of the 925. Sushi , sashimi, nigiri, Teishoku, Nabemono, Shabu Shabu, Ramen, Udon, Asahi, Sapporo, hot and cold sake. Special sake imported from japan, menu changes frequently so stop by to see our special. Pacific Hemisphere Blue Fin Tuna.