Preheat oven to 250 degrees. Rinse off the ribs well and pat with paper towel to dry.

Put a large frying pan on medium-high flame. Once hot, cook ribs on each side for 3 minutes.

Put the ribs in a roasting pan. Sauté the onions in the same pan as the ribs using the rib fat that oozed off as oil until they are a golden brown. Stir in all the rest of the ingredients. Bring a to a boil then lower the flame. Pour this mix over the ribs slowly to cover fully.

Cover the roasting pan with the sauced ribs inside and bake for 3 hours, flipping halfway.