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Watercress is a fast-growing, aquatic or semi-aquatic, perennial plant native to Europe and Asia, and one of the oldest known leaf vegetables consumed by humans. It is a member of the family Brassicaceae, botanically related to garden cress, mustard and radish. All noteworthy for a peppery, tangy flavour.

Rumex acetosella is a species of sorrel, bearing the common names sheep's sorrel, red sorrel, sour weed, and field sorrel. There are several uses of sheep sorrel in the preparation of food including a garnish, a tart flavoring agent, a salad green, and a curdling agent for cheese. The leaves have a lemony, tangy or nicely tart flavor.

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