This app offer you tons of information about what sushi is, how to prepare sushi and where to find the best sushi places.
Here is the website of Sooshi: http://www.getsooshi.com/
The 70% reason I like this app because of visual design, the rest of reasons are about the parallax effects which fit for iOS 7’s new experience design, it use a simple and clean way to express how to use, not only offer the information, most important is expressing the culture of Japan.