Slow Cooker Italian Beef Sandwiches with Chicago-Style Hot Giardiniera

Slow Cooker Italian Beef Sandwiches with Homemade Hot Giardiniera, a Chicago favorite, with thinly sliced, slow-cooked, juicy beef, melted cheese, and some homemade, Chicago-Style Hot Giardiniera to really pack in the flavor for the ultimate Italian Beef Sandwich.