Ingredients

8 ounces rib eye steak (I think they may have called it shell steak)
salt
pepper
seasoning salt
1 large onion, sliced
2 tablespoons butter
1/2 cup sour cream

Directions

Season steak with salt, pepper and seasoned salt to taste.In a large skillet, melt butter and add sliced onion. Cook on medium low heat, cook until onions become tender and lightly browned. About 10 minutes.Meanwhile, cook steak on the grill until it reaches your desired liking.Add sour cream to the onions and stir to combine. Pour the mixture over the top of the grilled steak.

Variation: You could add mushrooms with onions during the saute. This restaurant did not to my recollection, but that would also be yummy.