4 tb Butter 4 lg Onions--sliced 2 ts Sugar 3/4 c Espresso coffee 1/2 c Chicken stock Onions with Espresso Coffee Salt/fresh pepper to taste Heat the butter in a skillet. Add the onions and cook, stirring, for 15 minutes. Add the sugar and cook 1 minute. Add the coffee, chicken stock, salt and pepper. Continue to cook and stir occasionally until the liquid reduces and evaporates, 15 to 20 minutes longer.