These sweet, spicy pickled onions are quick and easy to make. This is not a processed pickle but rather what is commonly known as "refrigerator pickles". That's why they are so easy. However, they must be stored in the refrigerator and should be consumed in about 1 week.
If you want a spicier pickled onion, do not remove the seeds from the jalapeno peppers. That's where much of the heat comes from.