Puree of Four Onion Soup with Gruyere Toast
- 5 cups chopped yellow (sweet) onion - 1/2 inch dice
- 2 1/2 cups chopped red onion - 1/2 inch dice
- 2 1/2 cups chopped white onion - 1/2 inch dice
- 2 cloves garlic, minced
- 2 bay leaves
- 2 sprigs of thyme
- 6 tbsps unsalted butter
- 2 tbsps olive oil
- 1 cup Cab/Merlot (or other rich red wine)
- 1/4 cup flour
- 8 cups beef broth
- 1 French baguette
- Gruyere cheese
- kosher salt
- fresh ground black pepper
- parsley for garnish
In a large soup pot over medium low heat add the butter and olive oil. Once the butter has melted, add the onions, garlic, bay leaves and thyme. Saute uncovered stirring every few minutes until the onions have softened and browned - about 25 minutes.
Raise heat to medium and add wine. Continue to simmer until the wine has almost evaporated, about 5 minutes. Add the flour and continue to cook for a couple minutes to cook out the raw flour taste.
Add the beef broth and stir. Bring to a simmer, then reduce heat to low. Allow the soup to cook uncovered for an additional 20-30 minutes to allow the flavors to combine.
Puree the soup using an immersion blender (one of my favorite kitchen gadgets) or transfer to a blender and puree until smooth. Add 3-4 tsp salt (this amount can vary depending on the beef broth you purchase - start with 2 tsp, taste then add more to taste) and 1/2 tsp fresh ground black pepper. Stir to combine.
Set your oven to broil. Cut the baguette on a diagonal in 1/4 inch thick slices. Place the baguette slices on a sheet tray, brush with olive oil on one side and sprinkle with salt. Place in the oven and broil for a couple minutes until the top of the toasts turns light brown. Remove from the oven and flip the toasts over. Sprinkle the toasts generously with grated Gruyere cheese. Put the toasts back in the oven and broil for a couple minutes until the toast's cheese is melted and starting to turn golden brown.
Serve soup in bowls with the toasts on the side. Garnish with fresh parsley.