Onions is better to take small, type sample. Can and sets, but cleaning it will torment, can and larger, cutting it in half. So important to peel the onion so it does not fall apart during cooking, ie you need to leave the bottom.

Fry the peeled onions in olive oil until Golden Bochkov. Of course, you can use another vegetable oil.

To continue: fill the onions with sugar and fry until caramelization 7 minutes, add wine and add salt, fry until evaporation of the wine, pour in the water, diminish the heat to low, cover the pan with a lid and stew for 5 minutes, remove the lid and evaporate the remaining liquid.

Remove pan from heat, add vinegar, stir and spread the onions into a suitable jug.