Dry cuttlebone can be soaked in hot water or cold water. Usually you can soak in hot water 15 minutes or so, and soak in cold water for about half an hour.

For dried taro without sediment, it can be directly used to make all kinds of delicious food after soaking. However, if you unfortunately buy dried bamboo shoots with sediment, it will be more troublesome to handle.

First, use scissors to break the soaked dried taro, then dig out the black sandbag and cook it repeatedly with water. This method doesn't seem too troublesome, but it takes a lot of time and energy to do it, and no matter how it is washed repeatedly, there will still be a small amount of fine sand hidden in the razor clam meat.

Moreover, after soaking and repeated washing, the fresh flavor and nutrition of dry water with sediment are basically lost. So try not to buy dried razor clam with sediment.