Cream of Mushroom Soup

Name: Cream of Mushroom Soup
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Yield: 6
Ingredients: Ingredients; 4 tablespoons extra virgin olive oil; 4 tablespoons butter; 2 pounds (900g) cremini (or button) mushrooms, cleaned and sliced 1/8-inch thick; Small handful shiitake mushrooms, chopped; 3/4 cup minced shallots (about 6 ounces, 170g); 3 cloves garlic, minced (3 teaspoons); 1 teaspoon kosher salt, plus more to taste; 3/4 teaspoon dried tarragon; 4 cups (1 liter) chicken stock (or vegetable stock for a vegetarian option); 1/2 cup (120 ml) heavy cream; 1/2 teaspoon freshly ground black pepper, or more to taste