Another classic comfort soup for the remaining bit of cold weather. The key is letting the onions cook slowly (on your lowest heat) and for a very, very long time. And of course, an obscene amount of grated cheese and toasty bread helps as well. We had ours in mini ramekins, so the cheese/bread to soup ratio was pretty much even. I highly recommend this approach. Happy Soup Monday, friends.
Onion Soup Au Gratin
Adapted from
Bistro Cooking at Home
Ingredients:
2 tablespoons butter
2 medium onions, thinly sliced
Salt and freshly ground pepper
1/2 cup dry sherry or port (I used red wine we had on hand)
5 cups broth (chicken, beef or veggie)
1 baguette
2 small garlic cloves, finely chopped or minced
1 teaspoon olive oil
6 ounces Gruyere cheese, shredded
Melt the butter in a wide soup pot over medium heat. Add the onions, season with salt and pepper and cook over medium-low heat, stirring occasionally, until onions slowly brown. This will take 30-45 (this took at least an hour, if not more) minutes; the longer the onions cook and the lower the heat, the darker and sweeter they will become.
When the onions are browned to your liking, add the sherry or port, the broth and 3 cups of water to the pot. Stir, scraping up any browned bits stuck to the bottom of the pan. Bring the soup to a boil, lower to a simmer, and cook for about a half hour to meld the flavors. Taste and season with more salt and pepper if needed.
When ready to serve, heat the broiler. Cut baguette into slices about 3/8 inch thick. You want enough slices to cover the soup bowls. Put the slices on a baking sheet and toast them lightly under the broiler. Mix the garlic with the olive oil and spread a thin layer over each toasted bread slice.
Set four ovenproof soup bowls on the baking sheet. Ladle soup into bowls. Put a slice or two of the baguette on top of the soup. You want to cover the surface almost entirely without any overlap - cut the slices to fit, if need be. Sprinkle the toast with a handful of cheese. Carefully slide the baking sheet (it will be heavy) into the over and melt the cheese under the broiler until it just starts to brown in spots, about 2 minutes. Serve immediately, remembering that the bowls are extremely hot.