Cook the wild rice according to package instructions.
1 cup wild rice
Meanwhile, heat 1 tbsp of olive oil in a large Dutch oven over medium-low heat. Add the sliced mushrooms and cook, covered, for 5-6 minutes. Stir occasionally until they begin to release their juices.
Increase the heat to medium and add the Worcestershire sauce. Sauté the mushrooms for an additional 5-6 minutes. Add 2 tbsp of butter and sauté for another 2-3 minutes. The mushrooms will be tender and a rich, brown color when ready. Remove the mushrooms from the pot and set aside. Deglaze the pot with a little bit of vegetable broth.
In the same Dutch oven, heat the remaining 1 tbsp of olive oil over medium heat. Add the onion, carrots, and garlic. Sauté for 5-7 minutes until softened and fragrant.
2 tablespoon olive oil, 3/4 cup diced onion, 1/2 cup diced carrots, 2 garlic cloves
Stir in the fresh thyme, fresh sage, salt, and pepper. Pour in the broth and bring the mixture to a boil. Lower the heat and simmer for 10 minutes.
1 teaspoon fresh thyme leaves, 1 tablespoon fresh sage leaves, salt and pepper, 5 cups vegetable or chicken broth
Return the cooked mushrooms to the pot and stir in the cooked wild rice. Temper the heavy cream by mixing it with a little bit of broth from the hot soup in a small bowl, then add it to the pot. Simmer for another 5 minutes until the soup is heated through and slightly thickened.
3/4 cup heavy cream
Stir in the lemon juice and adjust with more salt and pepper if needed. Remove from heat and garnish with fresh parsley.