In a heated olive oil, onions, carrots, celery, finely chopped onions, slices of garlic, parsley, juniper berries, black pepper, rosemary, bay leaf, thyme are put in a frying pan in a heated olive oil. Keep over medium heat for 10 minutes, then pour white wine to cover the vegetables. Add vinegar, bring to a boil and hold on low heat for another 30 minutes. Then they put it to cool. The game is lowered into the cold marinade for the whole night.