These quick-pickled onions are so easy, you can keep a batch in your fridge at all times. Ingredients - 1 red onion, thinly sliced - 1 cup water - 1 cup white or apple cider vinegar - 3 tablespoons sugar - 2 teaspoons salt Pack sliced onions into a quart-size microwave-safe jar; add water, vinegar, sugar, and salt. Microwave until steaming, about 2 minutes, 30 seconds. Carefully remove jar from microwave. Tighten lid, and shake the jar to help dissolve the sugar and salt. Let stand at least 2 hours. Refrigerate up to 1 week. #pickledonions #quickpickle #picklingfood