2tablespoonsvegetable or canola oil(or another neutral oil)
3poundswhite or yellow onionspeeled and thinly sliced
½teaspoonkosher salt
1 ½tablespoonsgranulated sugar
½cupdry white wine(or dry red wine)
5cupsbeef or vegetable stock(hot)
Salt and black pepper to taste
3-4tablespoonsdry sherry
3-4sprigsfresh thyme
1 ½cupsgrated cheeseGruyere, Swiss or Gouda
Instructions
Croutons
Preheat the oven to 375-degrees F.
In a small bowl or glass measuring cup, combine melted butter and olive oil.
Place the bread on a baking sheet lined with parchment paper and brush both sides of each piece with butter/oil mixture. Sprinkle one side of each bread slice with fresh parsley, and season with salt and pepper.
Toast in the oven until lightly browned and very crisp, about 8-10 minutes; set aside until needed.
Onion Soup
In a large pot or Dutch oven over low-medium heat, add the oil and butter. Once the butter is melted and there are some bubbles, add the onions and season with a pinch of salt. Cook the onions until they are tender, about 10 minutes. Stir occasionally with a wooden spoon or heat-resistant spoon. (adding the Dutch oven lid will help them cook more quickly)
Increase the heat to medium, add the sugar and continue to cook, stirring occasionally, until the onions are meltingly soft and dark golden brown (caramelized), about 20-25 minutes.
Add the wine, and cook until the liquid is reduced by half. Add the hot stock to the onion mixture, and season with salt and black pepper to taste. Simmer over medium heat for 10-15 minutes. Remove from the heat, and add sherry.
Place the ovenproof soup bowls or crocks onto a sheet pan lined with aluminum foil or parchment paper. Evenly divide the soup amongst the bowls, being careful to distribute the onions. Float a crouton on top of each serving, and sprinkle with grated cheese.
Place the soup bowls under a hot broiler, and broil until the cheese is browned and cheese bubbly. Serve immediately.
Notes
For a thicker broth, add a few tablespoons of all-purpose flour to the caramelized onions, cook for 1-2 minutes. (Before adding the wine)Cut the baguette on a slight angle, into ¾-inch slices.Use a mixture of Gruyere, Swiss, Gouda or mozzarella.