Prep time: 30 minutes Total Time: 2 hrs Ingredients: Servings: 6-8 Units: US | Metric 5 -6 cups yellow onions, thinly sliced (about 1 1/2 to 2 lbs) 1 tablespoon cooking oil 2 tablespoons butter 1/2 teaspoon sugar 1 teaspoon salt 3 tablespoons flour 6 cups beef stock (preferably homemade)...