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.
Bichon au citron
The bichon au citron is a French pastry. It is similar to a turnover in size, shape, and that it is made of puff pastry. A major distinguishing feature is that it is filled with lemon curd. The outer layer of sugar is sometimes partially caramelized.