French Onion Soup : Au Pied De Cochon Re

Au Pied de Cochon is the Paris brasserie that’s been serving onion soup to Les Halles regulars for decades, and this version takes a slightly unusual route. Most French onion soups lean on beef stock; this one uses chicken broth, which keeps the bowl lighter and lets the caramelized onion sweetness lead.

Cook the onions slow. Forty-five minutes covered over medium heat, stirring now and then, until they collapse into a deep amber jam. Rushing this step is the single biggest mistake home cooks make. Pale onions equal pale soup.

Deglaze with dry white wine, scrape every browned bit off the bottom of the pot, and let it bubble down before the stock goes in. That fond is half the flavor.

Simmer uncovered ninety minutes to concentrate the broth. Then comes the broiler moment: toasted baguette across the top, a generous handful of Gruyère, and a hard blast of heat until the cheese bubbles and the edges go bronze.

Pro Tips

• Make it a day ahead. Flavor deepens overnight in the fridge, and a quick simmer brings it back.
• Use yellow onions, not sweet Vidalias. You want savory bite, not extra sugar.
• Toast the baguette dry, so it stays crisp under the cheese instead of going soggy on contact with the broth.
• Use real Gruyère if you can find it. Comté or Emmental work as substitutes; pre-shredded “Swiss” does not.

Variations

• Stir a splash of dry sherry or brandy into the bowls just before the bread goes on for a sweeter, richer top note.
• Sub beef stock or a 50/50 chicken-beef blend for a heartier, classic Lyonnais profile.
• Layer a thin slice of sharp Cheddar over the Gruyère for a more pungent gratin top.