Can i substitute the mushrooms in a beef wellington?!
Yes you can, it just wouldn't be called beef Wellington anymore.
I have seen it done with spinach which gives a nice green layer.
Beef Wellington calls for duxelles, which are mushrooms chopped fine and sauteed with herbs.
I don't know what you'd replace them with, but if you did, you really couldn't call the dish Beef Wellington.
Lol , the dish actually calls for pate , mushrooms are a substitute for that. You may as will go back to the original and use pate.
You can just omit them and it is just as good.