Paris silverskin is my onion of choice. it's a small silverskin onion especially for pickling.
I have also had good success with using any old onion from seed and planting them in clumps of 10-15 in the same hole, the competition is so high they don't get bigger than a table tennis ball, and most are half that size.
Use weak vinegar for watering and then you lift them ready pickled. When we were little my dad told me about his kipper fishing trips. Apparently the only way to catch kippers is to hold a lighted candle underneath the boat to attract them.
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