"What kind of dishes do you use dried shiitake mushrooms for?" I once took a KYOTO-COOP delivery truck and, together with the delivery staff, visited about ten places where dried shiitake mushrooms were being delivered.
 
Everyone's answer was the same. "Chirashi-zushi. When my grandchildren come, when friends come over, at local festivals, and when I want to eat. Now that I think about it, I eat it all the time. lol."

That's Kyoto, the ancient capital of Japan!
 
People who like chirashi-zushi make only the fillings in advance. They make a large quantity of chirashi-zushi fillings in bulk, divide them into small portions, and freeze them.
All you have to do is mix the rice with the sushi vinegar and then add the thawed fillings, and in no time at all, you will have authentic homemade chirashi-zushi!
By all means, try making and freezing "chirashi-zushi fillings."

I'd love to have some gorgeous seafood chirashi-zushi for our celebration! Chirashi-zushi becomes wonderfully delicious when it contains stewed Shiitake. Even if you don't have a sushi tub, there is a particular recipe for making delicious sushi rice with a wooden cutting board, so please refer to it. Making Delicious Sushi Rice the Easy Way on a Wooden Cutting Board