Onion Preserve / Pickle / relish / Chutney is a semi thick spicy jelly like coarse paste usually an accompaniment for south Indian tiffin items. In our family we make this thokku in big batches and store for upto 6 months. Great for picnics, instant side for any tiffin like idli dosa or puri. We even spread this on a plain bread toast and quick snack. Fresh ingredients, more oil and using dry spoon every time.. will make this preserve last for long time. Only disadvantage it takes about 1 1/2 hours approximate to make this thokku, which is worth a try for its uses.