Mushroom filling is generally associated with uszka or little ears. And uszka are a necessary addition to borscht in Poland.
Traditional uszka are quite difficult to make so uszka served in borscht in Poland comes in many shapes. Regardless of the shape, all uszka have one common ingredient. And that is the mushroom filling.
Mushroom filling is easy to make. It can be made from any mushrooms available. They can be fresh or dried.
Whether you use fresh or dried mushrooms, critical to making this filling is the recognition that the end product should be dry.
To achieve that level of dryness, you have to be patient and stir the mix until all the water evaporates from the mushrooms during the cooking process. And you have to be patient and stir constantly so that you do not burn the mushrooms.
Once you have the filling, the real work begins. Making uszka can be quite tedious and time-consuming. Perhaps one of the most useful things that you can do is get an uszka forming tool. With the you can make up to 55 uszka at one time.
And here is how to make uszka.