Top Ten Pickles What is a pickle? It's a vegetable or fruit preserved in vinegar or brine. They have been used through out time to keep foods for a long time without keeping them in the fridge. Pickles have been popular for thousands of years, with Cleopatra attributing her beauty to her diet of pickles! They are still very popular today and in celebration of Pickle Day, we have rounded up some of the best for you to choose from.