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What is a pickle? A pickle, at its most broad and basic, is just a vegetable that has been made sour. Pickling refers to the act of souring (or acidifying) something (usually vegetables, but sometimes fruits, eggs and even meats).
The magic berry that turns sour food sweet. It sounds like something Willy Wonka might have invented at his chocolate factory - a berry that can make everything sour taste sweet. Lemons lose their sharpness, vinegar tastes like sherry and a pint of Guinness comes to resemble chocolate milkshake.