Can You Freeze Mushrooms?
Yes, mushrooms can be frozen, but they freeze best when cooked first. Raw frozen mushrooms become mushy and watery when thawed. Sauté mushrooms until most moisture evaporates, cool completely, then freeze in portions. They last 10-12 months frozen and work great in cooked dishes.
Key Takeaways
- Raw mushrooms have very high water content (about 90%).
- Steam-blanching is an alternative to sautéing, but sautéed mushrooms generally have better flavor.
- Duxelles (finely chopped mushrooms cooked with shallots) freezes excellently.
Explanation
Raw mushrooms have very high water content (about 90%). When frozen raw, ice crystals rupture cell walls, resulting in a mushy, watery texture when thawed. Cooking before freezing removes much of this water and results in better texture.
To freeze mushrooms: clean and slice them, sauté in butter or oil until they release their liquid and it mostly evaporates, cool completely, then freeze in single layers on baking sheets before transferring to freezer bags.
Use frozen sautéed mushrooms directly in cooked dishes like soups, stews, pasta sauces, and casseroles. They do not need to be thawed first. The pre-cooking actually makes them more convenient since they are already partially prepared.
Different mushroom varieties respond to freezing in distinct ways. Button and cremini mushrooms are the most forgiving and maintain good flavor after sauteing and freezing. Shiitake mushrooms actually concentrate in flavor during the sauteing step because they start with less water (about 82% versus 92% for buttons), producing an intensely umami-rich result from the freezer. Delicate varieties like enoki and oyster mushrooms become too soft even when cooked first and are better dehydrated than frozen.
Steam-blanching is an alternative to sauteing that works well for large batches. Place cleaned, sliced mushrooms over boiling water for 3-5 minutes (3 for small slices, 5 for whole caps), then transfer immediately to an ice bath. This method deactivates enzymes that cause flavor and color loss during storage. Steam-blanched mushrooms lack the caramelized flavor of sauteed ones but are more neutral in taste, making them versatile for adding to any recipe later. They keep for 10-12 months at 0°F (-18°C).
Mushrooms contain glutamate, the amino acid responsible for umami or savory flavor, at concentrations of 50-180mg per 100g depending on the variety. Sauteing concentrates these glutamates by removing water, and freezing locks in this concentrated flavor. Dried porcini mushrooms can also be frozen after rehydrating and sauteing, preserving their intense flavor for risottos, pasta sauces, and gravies.
Things to Know
- Steam-blanching is an alternative to sautéing, but sautéed mushrooms generally have better flavor.
- Duxelles (finely chopped mushrooms cooked with shallots) freezes excellently.
- Dried mushrooms are an alternative preservation method with even longer shelf life.