Saute the onions in a skillet over medium-low heat until translucent and caramelized, about 10 minutes. Add the brown sugar and stir until dissolved. Deglaze the pan with both vinegars and the wine. Simmer on medium-low heat until all the liquid has been evaporated, about 15 minutes.

This recipe was provided by a chef, restaurant or culinary professional and may have been scaled down from a bulk recipe. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.