I had a combination of white and brown shimeji mushrooms in the fridge. When we fired up the Weber grill the other day for barbecued chicken, I also made Miso butter flavored shimeji mushrooms (in an aluminum foil packet on the grill). Because the barbeque that day included other dishes including fish, we only ate a little of the shimeji. Several days later, I made this "otoshi" drinking snack from the left over barbecued chicken (I used the tenderloins) and the shimeji dish. The left below is cold "spooned" tofu (or "Sukui-dofu" 掬い豆腐) topped with miso butter flavored shimeji mushrooms and the right is shredded chicken tenderloin dressed in sesame dressing 鶏肉の胡麻和え.
Chicken: I used two tenderloins from the barbecued chicken which was very moist. I hand shredded the chicken along the grain of the meat.
Sesame dressing: I mixed white sesame past or shiro-neri goma 白練り胡麻 (1 tbs), sugar (1 tsp), mirin (1 tsp), soy sauce (2 -3 tsp), rice vinegar (1 tsp). Tasted and adjusted the consistency by adding more liquid (if seasoned enough, add "dashi"broth or one of the liquid ingredients). As the chicken meat tends to absorb the moisture from the dressing, it is better to have the dressing somewhat liquid and loose. I got lazy and used roasted white sesame as a garnish (you could have added dry roasted and ground sesame in the dressing for a better result).
The sukui-dofu was from a package which I got at the Japanese grocery store. I spooned several spoonfuls on the plate and then placed the leftover shimeji mushroom on top followed by some, thinly chopped scallion, Japanese one flavored red pepper flakes and drizzled "mentsuyu" 麺つゆ noodle dipping sauce from the bottle.
Since I had cucumber asazuke 胡瓜の浅漬け with salted kelp 塩昆布, I added that as well on the side of the chicken. For leftover control, this is decent drinking snack to start.