Escarole is a lovely green from the endive family, slightly bitter with hearty leaves that can stand up to cooking. Although it’s available year round, it can be hard to find in regular grocery stores. Peak season is the spring and summer months. It’s especially popular with Italians, who love their bitter vegetables (think rapinni, or radicchio) because they so deliciously offset rich and fatty meats.
Segarini: Don't Believe a Word I Say 