Onion Soup

Ingredients

• butter
  6 ounces
• onions

  thinly sliced
  3 large
• port
  2 ounces
• balsamic vinegar
  2 ounces
• quarts/2.2 liters dark chicken stock
  2 unit
• ounces/112 g slab bacon

  cut into 1/2" x 1 cm cubes
  4 unit
• bouquet garni
  1 unit
• salt & pepper
  1 unit
• baguette croutons (slice and toast in oven with olive oil)
  16 unit
• ounces/340 g grated Gruyère cheese (or swiss cheese)
  12 unit