Curt : shrooms marinated in oil,saysauce,garlic and salt/pepper.
And for the shoulder "steak" its probably the most common thing to grill here in sweden(well exept for hot dogs)so its not like im reinventing the weel here
Altho i think there is a bit to mutch fat in a steak like that so i trimmed and then on a skewer for easy handeling.(almost like the greek gyros)