Eden Shiso Leaf Powder (Pickled Beefsteak Leaf) Is A Delicious Salty, Sour Table Condiment Made From The Pickled Leaves Of The Red Beefsteak Leaf, Or Shiso Perilla Frutescens Var. Crispa. It Is Made By The Ancient And Traditional Process. Unripe, Green Umeboshi Plums Prunus Mume Are First Pickled With Sea Salt And Red Beefsteak Leaves. The Leaves Turn The Plums And Pickling Liquid Red. The Red Liquid That Is Squeezed Out Of The Plums Is Called Umeboshi Plum Vinegar Or 'Ume Su'. During The Pickling Process These Naturally Bitter Leaves Take On A Salty, Sour Flavor. After Several Days The Leaves Are Removed From The Kegs, Dried And Ground Into A Fine Powder Before Packaging.