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Wild Mushroom Caramelized Onion and Kale Soup

Wild mushroom caramelized onion and kale soup made in one pot with deep mahogany caramelized onions, browned mixed mushrooms, and a savory porcini-infused broth. Finish with wilted kale and fresh thyme, then top with Parmesan and a drizzle of truffle oil for a restaurant-style bowl.
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Prep Time 20 minutes
Cook Time 50 minutes
Total Time 1 hour 10 minutes
Servings: 6 servings
Course: Main Dish
Cuisine: American
Calories: 330
Ingredients Equipment Method Notes

Ingredients
  

Mixed wild mushrooms (shiitake, cremini, oyster)
  • 1 lb mixed wild mushrooms (shiitake, cremini, oyster) sliced
Dried porcini mushrooms
  • 1 oz dried porcini mushrooms soaked in hot water; reserve soaking liquid
Onions
  • 3 onions large, thinly sliced
Kale
  • 4 cup kale stems removed and chopped
Garlic
  • 6 garlic cloves, minced
Broth
  • 6 cup beef or vegetable broth
Dry sherry or white wine
  • 1 2 dry sherry or white wine use 1/2 cup
Butter
  • 3 tbsp butter
Olive oil
  • 2 tbsp olive oil
Fresh thyme
  • 1 tbsp fresh thyme
Balsamic vinegar
  • 1 tbsp balsamic vinegar
Parmesan shavings
  • 1 parmesan shavings for serving
Truffle oil
  • 1 truffle oil for serving
Salt and pepper
  • 0.5 salt and pepper to taste
Hot water
  • 2 cup hot water for soaking porcini

Equipment

  • 1 Dutch oven

Method
 

Caramelize onions
  1. Melt the butter with the olive oil in a large heavy pot over medium heat. Stir occasionally and cook the onions for 35-40 minutes until they turn deeply golden and caramelized (dark mahogany color at the edges).
Brown mushrooms and build flavor
  1. Add the garlic and the sliced mixed wild mushrooms to the pot. Cook for 8 minutes, stirring as needed, until the mushrooms are browned.
  2. Pour in the dry sherry (or white wine) and deglaze the pot. Cook for 2 minutes, scraping up any browned bits for a richer base.
Add porcini broth and simmer
  1. Drain the soaked dried porcini while reserving the soaking liquid. Add the porcini and the strained soaking liquid to the pot along with the broth, thyme, and balsamic vinegar.
  2. Bring the soup to a simmer and cook for 15 minutes. Keep it gently bubbling so the flavors meld.
Wilt kale and finish
  1. Add the chopped kale to the simmering soup. Cook for 5 minutes until wilted and vivid green.
  2. Season the soup with salt and pepper to taste. Ladle into bowls and top with Parmesan shavings and a drizzle of truffle oil.

Notes

For the deepest onion flavor, let the onions darken without rushing—keep the heat at medium and stir often so they caramelize evenly. Store leftovers in an airtight container in the refrigerator up to 4 days; reheat gently on the stove. Freezing is not recommended because kale can soften after thawing. Dietary swap: use vegetable broth (and a dairy-free butter substitute) for a vegetarian version while keeping the same mushroom-forward flavor.