Garden sorrel, also called common or english sorrel, resembles spinach, but its sour flavor (due to high levels of oxalic acid) is similar to lemon! The immature leaves of sorrel add a bit of zest to salads, while the more mature leaves bring a wonderful tartness to soups. Both nutritious and palate-cleansing, sorrel is loaded with potassium and vitamins A and C. Sorrel is a long-lived, cool-season perennial herb that provides tangy flavor from spring through fall ' just plant the seeds in early spring and enjoy picking the leaves as you need them!