I am not sure where I got this from. I do remember my aunt, the writer Alicia Plante, back in Buenos Aires, mentioning a recipe of baked fish with blue cheese that I prepared a few times. In the US I adapted it using big mushrooms instead of fish. But maybe I got the idea somewhere. 1 Get some big round mushrooms, for example, shitake mushrooms. I read that one should never wash the mushrooms with water as they get ruined somehow but gently remove any impurities with a soft brush.