Chicago-style giardiniera is a specific variation of the traditional Italian or Italian-American giardiniera, and it is closely associated with Chicago's culinary scene. This style of giardiniera is often characterized by its spicy and flavorful profile. The key components typically include a mixture of pickled vegetables and hot peppers in oil. It's commonly found in jars at grocery stores or local delis in the Chicago area and used on hot dogs and Italian beef sandwiches.