My cast iron frying pan used to make the best pancakes: light, fluffy, golden brown. After cleaning it one time I think I left it on the burner to long and it 'broke' (not physically) because now when I make pancakes one side of the pan cooks the pancake but the other side (nearest the handle) hardly cooks at all. The heat is no longer distributed evenly (obviously). It doesn't look any different, but it sure cooks (or not) differently. Can it be saved?