I went to a place that had gyros and out of curiosity I tried a shiitake mushroom one, and when I bit into it, I was convinced they had gave me one with beef by mistake, but they just laughed and said nope, that's how shiitake mushrooms taste and texture is, so it was basically a meat substitute. I was impressed with it. But otherwise just plain mushrooms aren't palatable, they're okay in a salad with dressing or cooked on pizza or when sauteed.