As an absolute adorer of mushrooms I've quizzed a lot of people on this, it's emphatically the earthy taste from my research and I do understand it having dry heaved a few times after ingesting the magic kind
Personally, I like mushrooms (cooked) but bland watery ones or the sliced tinned ones are shite.
Hence why I carry a mushroom knife every where I go on the off chance.
How do you feel about those watery bland mushrooms?