I love the sour taste of Sorrel. Its great raw in mixed green salads or as the main ingredient in the French classic, Sorrel Soup or the Eastern European classic, Schav.
Sorrel is a perennial in the Polygonaceae family along with such relatives as buckwheat and rhubarb. The reason I mention it now is that after 3 seasons ours has just bolted.
Enjoy it while you can.