Ingredients (in my version) are: zucchini, an onion, king trumpet (or other) mushrooms, a peeled potato, olive oil and/or butter, vegetable stock, finely chopped fresh dill, salt, and half and half.
In an appropriately sized soup pot, heat the oil/butter (I like to use a little of each) and add the onion, chopped with a little salt. Stir as the onion cooks until it is tender and beginning to show a hint of color (about 10 minutes). At the same time, in a separate pan, sautĂ© the mushrooms until golden. Next add the zucchini and potato, chopped, but not too finely, to the soup pot, add the cooked mushrooms, and then add the vegetable stock (about a quart, more or less, depending on how much zucchini, potato, and mushroom you have). Bring to a boil and then reduce the heat to a simmer and cook until the vegetables are tender (another 15-20 minutes). Turn off the heat and let the pot rest until the liquid has cooled a little. Add the dill. At this stage, the soup can be put in a blender to smooth into a puree, but I like it just as it is with the coarsely chopped vegetable and the mushrooms in pieces. Add the half and half (about half a cup; the original recipe calls for heavy cream, but half and half makes it plenty creamy in my experience). Adjust salt to taste. Enjoy hot – or enjoy it cold later. It's delicious either way.