Michael Ruhlman's No-Stock French Onion Soup

ALEXANDRA'S KITCHEN
9Ingredients
4Hours

Ingredients

US|METRIC
  • 1 tablespoon butter
  • 8 pounds onions (thinly sliced, see notes below)
  • kosher salt
  • freshly ground black pepper
  • 6 slices bread (country-style, — I used peasant bread)
  • 1/3 cup sherry
  • 1 tablespoon Balsamico Bianco (or white/red wine vinegar, optional)
  • 1 tablespoon red wine (optional)
  • 340 grams Gruyere cheese (grated)
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