French Onion Soup#1

The real deal. Six medium yellow onions cooked low and slow for 45 minutes until they transform from raw slices into a deep, caramel-colored tangle of sweetness. Deglazed with white wine, simmered in beef broth, ladled into ovenproof bowls, topped with a thick slice of French bread and a generous blanket of Swiss cheese and Parmesan, then broiled until the cheese bubbles and browns.

Caramelizing the onions is the heart of this soup, and there are no shortcuts worth taking. Thirty minutes covered over medium heat softens them completely, then 10 to 15 minutes uncovered at slightly higher heat drives off moisture and lets the natural sugars brown. A teaspoon of sugar helps the process along.

The flour stirred in after caramelizing thickens the broth just enough to give it body without turning it into gravy. One tablespoon for four cups of broth is the right ratio. The white wine adds acidity that balances the sweet onions.

The bread-and-cheese cap is what makes this gratinee, not just soup. The bread absorbs broth from below while the cheese melts into a stretchy, golden dome from above.

Chef Tips

• Don’t rush the caramelization. Low heat and patience create sweet, jammy onions. High heat burns them into bitter, black spots.
• Use ovenproof bowls or crocks. Regular ceramic bowls can crack under the broiler.
• Place bowls on a jelly roll pan for easy handling and to catch any overflow.
• Serve immediately. The cheese sets and toughens as it cools.

Variations

• Red wine version: Replace white wine with a dry red for a darker, more robust broth.
• Gruyère upgrade: Use Gruyère instead of Swiss for a nuttier, more traditional French flavor.
• Vegetarian: Use rich mushroom broth instead of beef broth and add a splash of soy sauce for umami depth.