Chicago-Style Hot Giardiniera is the amazing condiment that Chicagoans use to add an explosive burst of flavor to some of their famous dishes like Italian Beef Sandwiches and deep dish pizza. Loaded with finely chopped veggies, spicy peppers, olives, oil, and oregano, this flavorful addition will quickly earn a spot on your condiment shelf.
Add chopped veggies (except for olives) to a large glass bowl. In a large measuring cup, prepare a brine by combining the water and salt. Stir until salt has dissolved and pour the brine over the veggies. Cover and refrigerate overnight.
The next day, pour veggies into a colander and rinse off brine with water. Add rinsed veggies and olives to a large jar or several small jars (about 5 cups worth). In a medium bowl, combine canola oil and oregano, and pour over the veggies in the jars. Keep refrigerated. Let it marinate for at least 2 days before using. Enjoy!