Mediterranean. Santorini Restaurant offers bold, bright Mediterranean cuisine and a warm atmosphere just one block from San Francisco's Union Square. Shoppers can stop for lunch in the inviting dining room, or relax after a busy day of retail therapy and enjoy one of Santorini's many happy hour specials. An ample wine menu includes offerings from Italy to California, reflecting Santorini's all-encompassing Mediterranean aesthetic. Serving classic Mediterranean and American food for breakfast, lunch and dinner, Santorini caters to the droves of hungry tourists, shoppers and locals flooding Union Square for a day of work or play.