If you've ever had a cup of Earl Grey tea, you've had bergamot. Earl Grey tea's characteristic citrus/floral flavor comes from the addition of dried bergamot peel or bergamot oil. Bergamot is a type of citrus that originated in Italy and is believed to be a cross between a lime and a sour orange.
The rind of bergamot contains a large amount of essential oil, which have both culinary and cosmetic purposes. The flesh is very sour and does very well in curds and marmalades. The zest of bergamot is often used in pastries and other sweet confections.
(Image: Kathryn Hill)