Mystery Spice?

My sister-in-law went to visit a friend in Japan and asked what souvenirs we wanted. I told her that I would like some fun spices or seasonings to play with. She brought me a couple things, but doesn't cook herself, so we used Google Translate to try to figure out what they were. I was able to identify most of them.

I have a little jar of yuzu pepper mustard, a bag of purple powder that appears to be a rice seasoning made with plum vinegar, several packets with various heat levels that seem to be for soups and noodles (It comes with a little gourd container, I haven't written down the name yet), and one mystery spice that I could not find information for.

Google Translate shows the ingredients have a couple different kinds of mushrooms, but when I try to search the name of the product, it's apparently a person's name "Megumi of Satoyama". I can't figure out what the seasoning is for.

Does anyone recognize this, and can you give me guidance on what kind of recipes it goes with?