Why did my onions burn instead of turning sweet and golden?

The heat was too high or the stirring too infrequent, and usually it is a little of both. Keep the burner at medium low, stir and scrape every five minutes, and splash in water whenever the fond looks dark rather than amber. A heavy Dutch oven forgives a lot here, but patience is still the main ingredient.

Can I make classic French onion soup without a broiler?

Yes, and the result is still delicious. Ladle the hot soup into oven safe bowls, add the toasted baguette and the shredded Gruyere, then bake at 450°F for 8 to 10 minutes until the cheese melts and bubbles. For those bronzed spots without a broiler, finish with a kitchen torch for a few seconds per bowl.

What is the best cheese for French onion soup if I cannot find Gruyere?

Comte is the closest match, nutty and a beautiful melter, followed by Emmental or a good quality Swiss. A blend of Gruyere and white cheddar also works when you want extra tang and an even deeper golden crust. Whatever you choose, shred it fresh, since pre shredded cheese is coated to resist melting and never browns as beautifully.

Why does my soup taste too sweet?

Very sweet onions plus a long caramelization can tip the balance, especially if you used sweet onion varieties. Fix it with salt first, then a small splash of balsamic vinegar, and let the pot simmer five more minutes so everything marries. The salty Gruyere melted on top will balance the bowl even further.

Can I freeze French onion soup before adding the bread and cheese?

Absolutely, and the base freezes better without them. Cool the broth completely, freeze it for up to three months, then thaw overnight, reheat until steaming, and assemble with fresh toasts and cheese on serving day. Never freeze the assembled bowls, because the bread soaks up broth and turns to mush.

Classic French Onion Soup: No-Alcohol Cheesy Recipe

Ingredients

Scale

3 lb (1.4 kg) yellow onions, thinly sliced pole to pole
3 tablespoons unsalted butter
2 tablespoons olive oil
1 teaspoon kosher salt, plus more to taste
1/2 teaspoon freshly ground black pepper, plus more to taste
4 cloves garlic, minced
1 tablespoon balsamic vinegar
8 cups (2 quarts) low sodium beef broth
4 sprigs fresh thyme
2 bay leaves
12 slices baguette, cut 1/2 inch thick and toasted
2 cups (8 ounces) Gruyere cheese, freshly shredded

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Instructions

Halve, peel and thinly slice the onions into even half moons about 1/4 inch thick.
Melt butter with olive oil in a Dutch oven over medium heat; add onions and salt, toss to coat, and cook 10 minutes until soft and translucent.
Lower to medium low and cook 35 to 40 minutes, stirring and scraping every 5 minutes, until deep amber.
Whenever dark fond coats the bottom, splash in 2 to 3 tablespoons of water and scrape it loose; repeat twice more.
Stir in the garlic and cook 1 minute until fragrant, without letting it color.
Pour in the balsamic vinegar, scrape the pot clean, and bubble 1 minute until the sharp smell softens.
Add broth, thyme, bay leaves and pepper; simmer 20 to 25 minutes, then remove thyme stems and bay leaves and adjust salt.
Toast the baguette slices at 400F for 8 to 10 minutes, flipping once, until golden and crisp.
Ladle soup into 6 oven safe bowls, top each with 2 toasts and Gruyere, and broil 2 to 4 minutes until bubbly and bronzed; rest 2 minutes and serve.

Author: Chef Rita