Giardiniera is a mix of chopped up vegetables that are pickled in vinegar and spices. Think of it like a yummy salad that is all mixed up and packed into jars so that you can eat it later. The veggies that are typically used in giardiniera are cauliflower, celery, carrots, bell peppers, and spicy pepperoncini. It's really popular in Italian cuisine and people like to snack on it or add it to sandwiches and salads for some extra flavor and crunch. It's like a grown up veggie snack that tastes really good!