Old-Fashioned Salisbury Steak With Gravy
["1- lb lean hamburger", "1/3 c. finely chopped onion", "1/4 c. saltine cracker crumbs", "1 egg white, slightly beaten", "2 TBSP milk", "1 TBSP horseradish", "1/4 tsp salt, dash pepper"]
["MUSHROOM", "GRAVY:", "1- 12 oz jar prepared brown beef gravy; 4-oz mushrooms, sliced; 2 TBSP water."]
["lean hamburger", "onion", "saltine cracker crumbs", "egg", "milk", "horseradish", "salt"]