Onions are one of the oldest cultivated vegetables and are available throughout the year. Small white onions are best suited for this recipe as they are mild in flavour and do not colour the pickling liquor. Pickled baby onions have been popularly eaten throughout India. Here they have been salted in spiced and sweetened vinegar. Shallots or Madras onions can be treated in the same way. I have also added some garlic cloves for additional flavour and aroma. This pickle stays well for 2 to 3 months and it becomes sour with the passage of time. You can store it in the refrigerator to slow down its deterioration.