Woodland sorrel. Flowers, leaves and pods can be eaten and have quite a tangy flavour and are sometimes added to salads, or can be chewed as they are said to have thirst-quenching qualities. This has resulted in the leaves being used to make a lemony drink or it may be brewed as a herbal tea, though the flavour is a little dull. Apparently the juice can be used as a substitute for vinegar.
