Citron
The citron ("Citrus medica") is a large fragrant citrus fruit with a thick rind. It is one of the original citrus fruits from which all other citrus types developed through natural hybrid speciation or artificial hybridization. Though citron cultivars take on a wide variety of physical forms, they are all closely related genetically. It is used widely in Asian cuisine, and also in traditional medicines, perfume, and for religious rituals and offerings. Hybrids of citrons with other citrus are commercially prominent, notably lemons and many limes.
Siracusa Lemon
The European Union has nine (PGI) denominations for lemons: six of these are from Italy, one from France, one from Spain, and one from Portugal. Other than the "Siracusa lemon", the Italian denominations are the "Limone di Sorrento", the "Limone Costa d'Amalfi", the "Interdonato di Messina", the "Femminello del Gargano", and the "Limone di Rocca Imperiale". The French denomination is the "Citron de Menton". The Spanish denomination is the "Citricos Valencianos", while in Portugal the "Citrinos do Algarve" is protected.