Slow-cooked onions turn deep gold and sweet, then sink into beef broth crowned with melted cheese and toast
Ingredients
FOR THE SOUP
- 6 tablespoons (90g) unsalted butter
- 3 pounds (1.4kg) of onions, sliced 1/8-inch-thick
- Kosher salt
- Freshly ground black pepper
- 1/2 cup (120ml) dry sherry (used in the video), brandy, or Cognac
- 2 quarts (1.8L) low-sodium chicken stock
- 1 teaspoon (5ml) apple cider vinegar
FOR THE CROUTONS
- 8 bowl-size slices rustic bread
- 4 medium cloves roasted garlic
- Rendered bacon fat
- 1 pound (450g) Gruyère cheese, grated
- Freshly minced chives, for garnish
Method
-
01
Melt butter and soften onions 8 min
8 minMedium-high heat, stir occasionally until softened.
-
02
Caramelize onions 90 min
1h 30mMedium-low heat, stir every 15 min until rich golden-brown.
-
03
Season and deglaze with sherry 3 min
3 minAdd seasoning and alcohol, simmer until alcohol smell gone.
-
04
Simmer soup with stock 40 min
40 minAdd stock, simmer 20-60 min, then add vinegar.
-
05
Toast bread slices until golden
5 minToast both sides of rustic bread.
-
06
Rub croutons with garlic and bacon fat
3 minWhile warm, rub each crouton with garlic and bacon fat.
-
07
Preheat broiler
3 minAdjust rack to top position.
-
08
Broil seasoned croutons until bubbly
4 minWatch for the cheese to bubble up around the edges and turn light golden brown — that's when you pull it, not a second longer or you'll get a hard, burned crust.
-
09
Add gruyère and broil until melted
3 minThe gruyère should be completely melted and bubbling across the surface with just a hint of color on top; if it's still pale, give it another 30 seconds under the broiler.
-
10
Assemble soup bowls with croutons
4 minOne crouton on bottom, ladle soup, second crouton on top.
-
11
Broil bowls with cheese until browned
5 minOptional step for traditional cheesy top.
-
12
Garnish with chives and serve
1 minA small handful of fresh chives scattered right before service brightens up all that rich, caramelized depth — don't skip this step.
From Mike's Notebook
Don't skip the 15-minute stirs during caramelization — those scrapes build the fond that deepens everything.
Add vinegar at the end, not the stock — it brightens the soup without thinning the caramel you worked for.
Stack your croutons in the bowl so the bottom one stays crisp and the top one catches the broiler heat.
Tell us how it went.
Be the first to review this recipe.