Ingredients

  • 1 1/2 c. unsalted butter
  • 4 large onions, chopped
  • 2 tsp. sugar
  • 1/2 c. flour
  • 6 c. canned beef broth
  • 6 c. canned chicken broth
  • salt to taste
  • 1/2 tsp. freshly ground pepper

Method

  • Melt butter in heavy 6-quart soup pot over medium heat.
  • Add onions; saute, stirring until wilted, about 20 minutes.
  • Sprinkle sugar over onions; stir to blend.
  • Increase heat to medium-high; cook, stirring, until onions are lightly browned, about 5 minutes. Reduce heat to medium.
  • Add flour; stir until combined.
  • Cook 3 to 4 minutes, stirring.
  • Slowly stir in broths.
  • Bring to a boil to thicken slightly.
  • Reduce heat.
  • Season with salt and pepper; simmer 1 hour, stirring occasionally.
  • Taste for seasoning; adjust, if necessary.