Cube steak and brown in oil, remove to casserole dish.
Saute onion, carrot and celery in pan until onion is soft, sprinkle in flour and stir over heat for 2 minutes, add stock and stir until thickened. Add to meat in casserole with sauce, seasoning and thyme then cover and cook in moderately slow oven (325 degrees) for 2 hours.
Increase oven temperature to very hot (400 degrees), make scone topping and place on top of casserole, cook uncovered in oven for 15-20 minutes.
Sift flour into a bowl and add half the butter with the milk. Mix to a firm dough with a knife, turn onto a floured board, knead lightly and roll out to a rectangle 1/2 inch thick.
Brush with remaining butter and sprinkle with parsley, cheese and a little onion or celery salt. Roll up firmly and cut into 1/2 inch slices with a floured knife and place on top of casserole.