What are the technical key points of scientific processing methods for shiitake mushrooms?

I. Sun-drying method: Sun-drying is the most convenient and easy method. The method is: spread the harvested shiitake mushrooms promptly on a sun-facing grain-drying yard or concrete ground. When drying, first place the caps upward and the stems downward, arranging them one by one. After drying until half-dry, turn the stems upward and the caps downward, until they are more than 90% dry. If rainy weather occurs, supplement with fire-powered drying.

II. Oven-drying method: After the shiitake mushrooms are harvested, they should be placed in small baskets, not packed too full to avoid crushing, and should be baked on the same day. The general method is: spread the harvested shiitake mushrooms on drying trays and send them into the drying room. At the beginning, the temperature should not exceed 40°C, then raise the temperature by 5°C every 3-4 hours, with a maximum not exceeding 65°C. The drying room should have exhaust facilities, exhausting air while drying; otherwise the gills of the shiitake mushrooms will turn black and affect quality. After they are 80% dry, take them out and spread them to air for several hours, then re-bake for 3-4 hours, until the moisture content is below 13%. The shiitake mushrooms dried in this way will be dry, good in color, and rich in aroma. After drying, the shiitake mushrooms should be graded promptly, and after grading, quickly sealed and packaged, and stored in a dry, cool place.