Mushroom Soup Recipe with Browned Cremini and Dried Porcini

Fresh mushrooms, porcini and the starting liquid

This soup starts with 500 g of prepared fresh cremini mushrooms and 15 g of dried porcini. The fresh slices become the pieces in the bowl, while the softened porcini and their filtered soaking liquid go into the soup base, the same pairing of soaking juice and stock that BBC Good Food's cream of wild mushroom soup builds on. Weigh the fresh mushrooms after you trim off any dirty stem ends. Buying exactly 500 g may leave slightly less for the pot, so weighing the trimmed amount keeps the recipe's starting point clear.

Cremini mushrooms are the cultivated brown mushrooms chosen for this version. White button mushrooms also work as the fresh ingredient, though swapping does not make every mushroom behave or taste the same. Choosing mushrooms for soup is a separate decision from how long to cook this pot. Here the fresh and dried ingredients have their own preparation steps, so a mixed packet of dried mushrooms cannot simply step in with the same instructions.

Clean the fresh mushrooms to remove visible soil before slicing. If they need a quick rinse, drain and dry the surfaces so you do not carry a pool of washing water into the pan. Slices of similar thickness cook together more evenly than a mix of thin scraps and thick chunks. Very thin slices also leave less to bite on after simmering, which shows when the finished soup is only partly blended.

The dried porcini need their own package directions for soaking and cooking. Copying a soaking time from another product cannot show that you prepared these pieces properly, and softening them is only one stage of the recipe. Once they have softened as directed, lift the porcini from the soaking water and look for trapped grit. The porcini supplier Fine & Wild recommends briefly rinsing the rehydrated pieces and filtering the liquid through a fine sieve lined with kitchen paper or muslin.

Plain sieves catch large fragments but let finer sediment through. That gap counts for more in a partly blended soup, because neither the cooked pieces nor their soaking liquid will pass through a final fine strainer.

For example, 150 ml of usable filtered soaking liquid leaves 650 ml of stock or water to reach the total. That is plain arithmetic and does not predict how much liquid a given packet will give. The amount left depends on how you prepared the dried pieces and how much liquid stayed in them, so measuring after filtering handles those differences without asking you to match one soaking yield.

If you add the soaking liquid without measuring it, the balance between cooked mushrooms and liquid shifts. More stock may still make a fine soup, but it will be a different strength from the formula on this page. Stock also brings seasoning, so a salty stock and plain water do not swap evenly at the final tasting. You can salt the mushrooms while they cook, and the finished soup still needs its own seasoning check once the liquid and any cream are in.

Leaving out the dried porcini removes both their cooked pieces and their soaking liquid. The starting liquid can still total 800 ml with stock or water, but the result is a fresh-mushroom version with a different flavor. Doubling the fresh mushroom weight adds fresh solids. It does not bring back the porcini or their soaking liquid.

From released mushroom water to a browned soup base

The fresh slices brown before the soup liquid goes into the pan. Browning adds a cooked surface flavor, and the later simmer brings the fresh mushrooms, softened porcini, aromatics and measured liquid together. Seeing a wet pan at the start does not mean the soup has failed. Mushrooms can release enough water to form a shallow pool, especially in a crowded pan, and while that water remains, the pan looks closer to simmering than searing even though the slices are already softening.

The Mushroom Council's saute method gives slices room for contact with the pan. Serious Eats shows a wetter start that moves on to searing once the water evaporates, so an early pool of liquid is a stage to work through and no reason to throw out the batch. For this recipe, cooking in batches makes that pan contact easier to manage. Batch size follows the usable base of your pan, so no fixed number of batches works for every skillet.

You split the 40 g of butter between the mushroom batches and the onion. Using only a light coating of fat lets the mushrooms cook without sitting in a deep pool, and holding some butter back gives the aromatics their own stage. Match the heat to the pan and the butter, since no single high setting suits every stove. If the butter or pan residue scorches while the slices are still pale, more heat will not fix it.

As the pooled water disappears, the slices can color against the bare pan. Judge by the color on a mushroom face after you turn it, more than by a quiet pan or a timer alone. Constant stirring moves each face away from the surface that would brown it. Leave the slices in contact, then turn them to check and cook another face, and the change shows without a fixed waiting time.

Brown cooking residue can join the soup when the liquid loosens it from the pan. Black, scorched material is a different result, and it is no flavor to scrape into the pot.

Once a batch has colored, set it aside while the remaining fresh slices cook. That way the first batch does not sit in the pan through every later one just to keep the mushrooms together. Cook the onion next, in the reserved butter. Garlic and thyme go in later, so the garlic does not sit through the whole mushroom-browning stage.

Adding a little of the measured liquid loosens the useful brown residue so it becomes part of the soup. That first splash counts toward the same 800 ml total and does not vanish from the ingredient math. The browned slices and softened porcini then go back into the pot with the rest of the liquid. The gentle simmer that follows cooks and combines everything, so the mushrooms need to cook through, following any cooking directions on the dried product.

Browned surfaces alone do not replace that requirement. Cremini cooking and dried porcini preparation stay separate even when both ingredients end up in the same pot. The listed prep and cooking times are planning estimates. Your pan width, batch sizes or a dried product with other directions can change the elapsed time without changing the stages the recipe needs you to see.

How much should you blend the soup?

This version keeps some cooked mushroom slices in a blended base. Blending part of the cooked solids spreads them through the liquid, while the unblended part gives recognizable pieces. Blend more for a smoother bowl, or stop earlier to keep more pieces, since no blender or batch needs exactly half the pot or a fixed number of seconds. You can set a few slices aside after the simmer to serve on top, which keeps the topping inside the finished cooking stage and avoids treating lightly browned pieces as ready to eat.

Use an immersion blender only if its manufacturer permits the hot-liquid use you have in mind. Its instructions set the vessel, working depth and handling limits, and the look of the soup cannot tell you any of them. The Vitamix immersion-blender manual, for example, gives the immersion and low-speed precautions below for its own appliance. Other devices may carry different limits, and a picture of a blender in a pot cannot make an unsuitable one safe for hot soup.

The optional finish is 100 ml of cream, stirred in after blending. It changes the soup's richness and flavor as well as its thickness. Without cream, the blended mushrooms and cooking liquid give the body. That is a valid finish for this version, but the butter stays in, so the soup is still not dairy-free.

Potato and cashews would bring different solids and preparation needs, so using either in place of cream would take a different formula. Soup can hold plenty of cooked mushroom solids and still taste under-seasoned. Seasoned broth can also feel too loose for the bowl you want, so adding cream or blending more does not fix every problem.

Any consistency fix changes the finished amount as well as the texture. Adding stock is a deliberate change that calls for another taste, and it does not prove the original measured liquid was wrong. Grit is hardest to deal with once the partly blended soup holds pieces worth keeping. Stopping it at the dried-ingredient stage spares you from choosing between sediment in the bowl and straining out the texture the recipe set out to keep.

How long does mushroom soup keep in the fridge?

Your four-serving pot may leave several portions to store. Dividing it into smaller containers keeps you from treating a deep pot of soup as one cooling portion. FoodSafety.gov advises refrigerating perishable cooked food within two hours, or within one hour when the air around it is above 90 F / 32 C. Its soup guidance lets hot food go straight into the refrigerator in smaller portions, so you do not need to leave the whole pot out until it is cold.

The refrigerator needs to stay at 40 F / 4 C or colder. Under those conditions, the government's cold-storage chart gives soups and stews three to four days in the fridge. Write down the cooking day so you can track that period, since reheating a portion does not start a new one. Reheat each portion to 165 F / 74 C, and use a food thermometer to check.

Thickening during reheating is a texture issue and does not replace the temperature check. Adding a little stock or water can loosen a portion that has thickened, but that changes the seasoning again, so taste it after it reaches the stated temperature. Discard soup kept past the stated refrigeration window. Reheating cannot make up for missed cooling and storage conditions.