Wash, peel, and dice potatoes, pears, and parsnip into small, evenly-sized cubes for quicker and uniform cooking.
Clean black trumpets by trimming the stems and removing debris. Slice fresh mushrooms or soak dried ones in warm water for 15 minutes.
Dice the onion finely. Heat olive oil in a pan and sauté the onions until golden and translucent, stirring often.
Add diced potatoes, pears, and parsnips to the pan. Season with salt, pepper, and a teaspoon of nutmeg. Stir fry for a few minutes.
Pour in 2 1/4 cups (560 ml) of vegetable stock. Simmer on medium heat for 20 minutes, or until the vegetables are tender.
Check seasoning, adjust salt and pepper, and stir in fresh parsley and 2 tablespoons of sour cream. If the soup isn’t sweet enough, add 1 teaspoon of honey. Blend until smooth.
Heat olive oil in a pan over high heat and stir fry the mushrooms for about 5 minutes until they release water and shrink. Season with salt to balance the soup’s sweetness.
Ladle soup into bowls, top with sautéed mushrooms, and sprinkle with sesame seeds or parsley. Add croutons or serve with fresh bread. Enjoy hot!