Aspects of this topic are discussed in the following places at Britannica.
...pungent, sour leaves are used as a vegetable, as a flavouring in omelets and sauces, and as the chief ingredient of creamed sorrel soup. The young leaves are used in salads. Two related species are garden sorrel (R. acetosa) and French sorrel (R. scutatus); both are hardy perennials distributed throughout Europe and Asia. Garden sorrel, like sheep sorrel, has become naturalized in...
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