Seasonal Japanese Ingredients and How To Use Them: Shiso The seasonality of Japanese vegetables is a part of what makes them so special. A summertime produce, shiso appears fresh on shelves for a few short weeks before disappearing for another year. The limited availability of this mysterious herb makes it all the more popular when it makes its yearly rounds. Full of calcium and iron, shiso (シソ), or “perilla leaf” in English, is a Japanese herb that we all may have unwittingly eaten…