Ingredients
3 tablespoons unsalted butter
3 to 4 large red or yellow onions (about 3 pounds), peeled and thinly sliced
¾ teaspoon kosher salt, more to taste
2 quarts (8 cups) beef stock
1 cup dry white wine
1 tablespoon dry sherry
1 tablespoon all-purpose flour
½ teaspoon black pepper, more to taste
French bread cut into 8 to 12 1/2-inch slices
1 ½ cups grated Gruyère cheese
Directions
Melt butter in a heavy Dutch oven over medium heat. Add onions and 1/2 teaspoon salt, stir and cover, letting onions soften for 5 minutes. Remove lid and let onions caramelize until golden brown over medium heat, stirring occasionally. Adjust heat if onions are browning too quickly. The caramelization process may take 45 to 60 minutes.
Meanwhile, warm broth in a saucepan over low heat.
Once onions are caramelized, add wine and sherry to the pot and allow mixture to come to boil. Stir in flour and let thicken for a minute or two.
Slowly add warm broth, 1/4 teaspoon salt and the pepper to the onion mixture and boil uncovered for 10 minutes. Add more salt and pepper to taste.
Heat the broiler, and arrange individual ovenproof casseroles on a baking sheet. Ladle soup into casseroles, and cover top with bread slices. Sprinkle each casserole generously with Gruyère. Broil for a minute or two, watching carefully, until cheese melts and browns. Serve immediately.
Servings
4-6
Source
Sara Bonisteel for the New York Times
Notes
Sumner grew onions in the garden and decided that he wanted to make onion soup. I'm so glad that he did as this was delicious. It was the only recipe that we looked at and it was perfect. We saved some calories and didn't use the bread and cheese. The soup was so good that it didn't need the topping.
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