Yes, Tesco does sell dried mushrooms. You can find them in the international aisle, near the other dried goods.
They come in a small plastic bag and cost around £1.50. The mushrooms are a dark brown colour and have a slightly sweet, earthy taste. They can be used in soups, stews, sauces and rice dishes.
To use dried mushrooms, simply soak them in warm water for 10-15 minutes until they are soft. Then drain them and add them to your recipe.
You can also reconstitute them in stock or wine for extra flavour. Dried mushrooms will keep for up to 6 months if stored in a cool, dry place.
So if you’re looking for an easy way to add some umami flavour to your dishes, pick up some dried mushrooms next time you’re at Tesco.