Transfer chicken to a plate to cool to room temperature, then slice. Return poaching liquid to a boil, and boil until reduced to about 1 cup sauce, about 30 minutes. Sprinkle sliced chicken with ...

Transfer the cooked chicken slices to a plate. Add the remaining oil to the pan and fry the onions for 3 minutes. Cover with a lid, lower the heat and cook for another 10 minutes to soften.