| http://www.w3.org/ns/prov#value | - Quercetin is a plant-derived flavonoid, specifically a flavonol, found in capers (1800 mg/kg), lovage (1700 mg/kg), apples (440 mg/kg), tea (Camellia sinensis), onion, especially red onion (higher concentrations of quercetin occur in the outermost rings), red grapes, citrus fruit, tomato, broccoli and other leafy green vegetables, and a number of berries including cherry, raspberry, bog whortleber
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