Fry the shredded meat in a pan with the addition of oil and remove it from the pan.
Boil the spaetzle in lightly salted water and rinse.
Peel the onion and cut into cubes. Clean the mushrooms and cut in half or quarter. Heat some rapeseed oil in a pan and fry the onions and mushrooms in it.
Now add the vegetable mixture and let it fry briefly. Mix in the salt, pepper and a little vegetable stock. Now deglaze the vegetables with the cream and add the hollandaise.
Add the cooked spaetzle and the roasted meat to the vegetables and heat briefly.