How to Rehydrate Dried Shiitake and Make Dashi: Time-Saving Tips and Popular Recipes

Dried shiitake supports the deep savory flavor of simmered dishes, mixed rice, and miso soup. It's a handy dried good to keep on hand, but it's also an ingredient that often raises questions like "what's the right way to rehydrate it?", "can I use the soaking liquid as stock?", and "how long does it keep?"

This page covers the steps for rehydrating dried shiitake and tips for saving time, how to make stock that makes use of the soaking liquid, popular recipes such as simmered dishes and mixed rice, and storage and best-before dates. It focuses on the points home cooks tend to puzzle over, such as the difference between donko and koshin and how to handle the stem.

What is dried shiitake?

Dried shiitake is fresh shiitake that has been dried. Drying not only improves how well it keeps but also draws out umami that isn't prominent when fresh, and it has long been used in Japanese cuisine as an ingredient that yields stock. It can be used simply by rehydrating in water, and it's a dried good that pairs easily with a wide range of dishes, from simmered dishes to mixed rice to soups.

The difference between whole, sliced, and powder

Dried shiitake comes in whole type, with the cap dried as is; slices; and finely ground powder. Whole type suits dishes where you want to draw plenty of stock from the soaking liquid, while slices suit shorter rehydration for quick use in stir-fries or miso soup. Powder lets you add umami to a dish with no need to rehydrate. Choosing the form to match your use makes cooking much easier.

Domestic dried shiitake isthe dried shiitake product page, and for the powder type,Shiitake powderintroduced here. For how to use mushrooms other than shiitake, seeDried mushroom usage guideis also a helpful reference.

The difference between donko and koshin

Dried shiitake is divided into "donko" and "koshin" by how far the cap has opened. Those harvested before the cap fully opens, thick and rounded, are donko; those with a large, open, thinner cap are koshin. Even with the same shiitake, the texture and suitable dishes change, so knowing this when you buy makes choosing easier.

• Donko: thick and chewy, suited to dishes where it plays the lead, such as simmered and braised dishes
• Koshin: thin and quick to rehydrate, suited to chopped uses such as mixed rice, chirashi sushi, and stir-fries
• When in doubt, donko for dishes where you want to show the shape, koshin for dishes where you chop and mix it in

How to rehydrate dried shiitake

Dried shiitake is used after rehydrating in water. Since how you rehydrate changes the texture and how the stock comes out, choose the method to suit your time. As a rule, rehydrating slowly at a low temperature draws out the umami and improves the result.

The basic method: rehydrate slowly in cold water

The basic method is to soak in plenty of cold water and rehydrate in the refrigerator for several hours to overnight. Rehydrating slowly at a low temperature keeps it from falling apart and draws plenty of umami into the soaking liquid. Whole type takes time to rehydrate plump all the way to the center, so soaking it in water the night before means it's ready to use the next day. It swells as it rehydrates, so use a bit less than the amount you need as a guide. For rehydrating dried vegetables in general, seeA guide to rehydrating dried vegetablesis also a helpful reference.

The quick method for when you're in a hurry

When you're in a hurry, soaking in warm water shortens the rehydration time. Adding a pinch of sugar to the water speeds rehydration through osmosis. Slices become usable in about 15 to 30 minutes. However, rehydrating all at once in boiling water softens the texture and lets the aroma escape, so for dishes where you want to make the most of the aroma, cold-water rehydration is recommended. After rehydrating, cutting off the stem base (the hard tip of the stem) before use gives a better mouthfeel.

Handling the stem, and points to know before rehydrating

After rehydrating, cutting off the stem base (the hard part at the tip of the stem) before use gives a better mouthfeel. Since the stem cooks less readily than the cap, slice it thin, or chop it rather than discard it and mix it into mixed rice or soboro to use it without waste. Also, dried shiitake isn't suited to being gnawed on raw without rehydrating. As a rule, rehydrate it in water and heat it before use.

• After rehydrating, cut off the stem base. Slice the stem thin or chop it to use
• Don't gnaw it raw without rehydrating; always heat it before eating
• Over-rehydrating and scrubbing washes out the umami, so handle it gently

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How to make stock that uses the soaking liquid

What makes dried shiitake so valued is that the soaking liquid itself becomes stock. Use it rather than discard it, and a dish's umami deepens a level. It's also used as an ingredient in the combined stocks of Japanese cuisine.

Don't discard the soaking liquid; use it as stock

Shiitake's umami compound is called guanylate, and combined with the glutamate of kombu or the inosinate of bonito flakes, the umami is felt more intensely. The soaking liquid can be used as is for the cooking liquid of simmered dishes, the cooking water for mixed rice, and the stock for miso soup. If the cloudiness bothers you, pour off the clear top portion gently for a clearer finish.

• Don't discard the soaking liquid; use it as stock for simmered dishes, mixed rice, and soups
• The more slowly you rehydrate at a low temperature, the more readily the umami comes out
• Combined with kombu, the umami is felt more intensely
• Avoid soaking liquid left long at room temperature; use it soon after rehydrating

For variations on dishes that use the soaking liquid, see10 selected dried vegetable recipes.

Popular dried shiitake recipes

Rehydrated shiitake can be used in many dishes, making the most of both the umami and the soaking liquid. Here are popular uses, from standards to make-ahead dishes.

Standards: simmered dishes and mixed rice

Rehydrated shiitake and its soaking liquid can take the lead in simmered dishes and mixed rice. Braised with chicken and root vegetables, or cooked into rice with fried tofu, are standards where the shiitake umami comes through strongly. Using the soaking liquid as cooking water spreads the umami through all the grains.

Miso soup, tsukudani, and make-ahead dishes

Sliced shiitake, once rehydrated, can serve as both the miso soup's ingredient and its stock. Tsukudani simmered sweet and savory with soy sauce and mirin suits an accompaniment to rice or a make-ahead dish. Combined with other dried vegetables, it broadens the variety of side dishes too.

Storage Method and Shelf Life

Dried shiitake is a dried good that keeps well, but how you store it changes how long the flavor and aroma last. Keep this in mind together with how to think about the best-before date.

Storage Tips Before and After Opening

Unopened dried shiitake can be stored at room temperature away from moisture and direct sunlight. After opening, close the bag tightly or move it to an airtight container, and storing it with a desiccant if possible gives peace of mind. Since aroma is everything for this ingredient, keep it away from strongly scented items. When you won't use it for a while, storing it in the refrigerator helps preserve the flavor. For detailed tips on storing dried vegetables, seehow to store dried vegetables and their best-before date.

How to Tell When It’s Past Its Best-Before Date

The best-before date is a guide for eating it at its best, so give priority to the product’s label. If it has taken on moisture and softened, has mold or discoloration, or the aroma has largely escaped, refrain from using it. Moisture is the greatest enemy of dried foods, so using it up early after opening gives peace of mind.

• Unopened: store at room temperature away from moisture and direct sunlight
• After opening: seal it and store with a desiccant for peace of mind
• For long-term storage, keep it in the refrigerator to preserve the flavor
• Once rehydrated, refrigerate and use it up the same day

Using dried shiitake commercially or for OEM

There are times you'll want to use it beyond the home scale, such as using large amounts at a restaurant or making it into an ingredient or stock base for your own products. In that case, commercial supply and OEM or contract processing are options.

Buy in bulk for commercial use, or use it as a stock base

If you use large amounts at a restaurant or facility, buying commercial-grade in bulk is efficient. Since shiitake yields stock, it's also used as an ingredient for vegetable stock and stock packs. For developing stock packs and vegetable stock, seeHow to start a stock OEMexplained here. Since powder type adds umami with no need to rehydrate, there's alsoShiitake powdera way to use it in seasoning design.

Use it as an ingredient for an original product

When you want to make your own branded product using mushrooms, starting with shiitake, contract processing that handles everything from drying and slicing to milling the raw material is convenient. For commercial OEM of mushrooms, seethe Commercial Mushroom OEM Guide, and for contract processing of dried vegetables in general, seeDried vegetable OEM and contract processingintroduced here. Domestic raw materials can be discussed from small lots, with a setup that's easy to use from the prototyping stage.

Frequently asked questions

Summary: the trick is to use dried shiitake with its soaking liquid

The basic trick with dried shiitake is to rehydrate it slowly in cold water and use the soaking liquid as stock. Its uses are wide-ranging, from simmered dishes and mixed rice to miso soup and tsukudani, and kept on hand, it lets you easily add deep umami to a dish. Store it away from moisture, and after opening use it up soon so the aroma lasts.

If you want to use it commercially at a restaurant, or as an ingredient or stock base for your own products, consider contract processing of domestic raw materials as well. Choose the form, whether dried, sliced, or powder, and orders can be discussed from small lots.