- Peel and cut the onions into small pieces.
- In a frying pan, cook the onions in a bottom of peanut oil, over low heat for ten minutes, mixing regularly.
- When the onions are translucent, add the wine, sugar and reduce almost all the wine, without stopping stirring, until you get a jam texture. Salt and pepper at your convenience.
- Fill in your jars with the hottest possible preparation, close them and immediately proceed to the heat treatment 30 minutes at 1200 ° C.

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