A small acidic orange with a peel that yields an essential oilcalled essence of bergamotwhich is used for perfumes and confections. The peel is used in earl grey tea. It's also candied and used in the same way as other candied fruit peels.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.