Place the butter and 3 Tbsp of the oil in a large pot and saute the onion or shallots, celery and garlic until softened. Add the soaked Shiitake mushrooms and all but ½ cup/ 55 g (optional-see rest of recipe) of the chopped white/crimini mushrooms and saute over medium high heat for about 5 minutes.
Add the broth (or water/bouillion mixture) and bring to a boil, then lower the heat and simmer for about 15 minutes.
Meanwhile, saute the remaining chopped mushrooms in the remaining 1 Tbsp of olive oil until they just begin to brown. Add a little sprinkle of salt and pepper. (If you do not want pieces of mushroom in the soup (i.e. if you want a completely smooth soup), skip this step and just saute all the mushrooms in the first step.)
Check the soup for salt, adding if needed, then remove from heat and blend with an immersion blender until smooth (or place in a blender, then return to the pot.)
Next, add the half and half, or whatever dairy product you are using, the sauteed mushrooms, ground black pepper and stir well.
Serve immediately, topped with some chopped, fresh parsley.
Notes
You can omit the Shiitake mushrooms and add more fresh mushrooms instead.
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