Soupe a L'Oignon Au Fromage

Ah, soupe a l’oignon. The crowned jewel of every Parisian bistro and the soup that proves onions deserve to be the star, not just a supporting player.

Six big onions get slowly cooked in butter until they turn deep golden and impossibly sweet, then a touch of flour and rich beef broth transform them into a silky, savory bowl of pure warmth.

But we all know the real showstopper: thick slices of crusty French bread floating on top, blanketed in Gruyere, and run under the broiler until the cheese bubbles and pulls into those irresistible golden strings.

This is the kind of soup that makes you close your eyes with the first spoonful.

Chef’s Tips

• Low and slow is the secret to caramelizing onions. Don’t rush it. Let them cook gently, stirring occasionally, until they’re deeply golden and jammy.
• Use a proper beef stock, not just broth from a box. The depth of flavor in this soup depends entirely on the quality of your stock.
• Oven-safe bowls or crocks are a must for the broiler step. Regular bowls can crack under that intense direct heat.
• Slice onions thin and even so they cook at the same rate. A mandoline makes quick work of this.