This radicchio is a red-leafed Italian chicory. Roasted chicory (also called succory) comes from the roasted, ground roots of some varieties of chicory. It's used as a coffee substitute, and added to some coffees for body and aroma and as an "extender." This coffee-chicory blend is often referred to as "New Orleans" or "Creole" coffee and is a popular beverage in Louisiana.
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.