Season steak with salt and pepper.
Press marjoram sprigs firmly onto one side of the steak and drizzle with oil.
Spread butter evenly on pan.
Add steak, herb side down and allow to form crust.
Thinly slice oyster mushrooms.
Cook mushrooms in butter with herbs and allow to caramelize.
When steak is 25% cooked through flip to sear other side.
Add mushrooms on top of steak and keep warm.