|Chopped onion||1⁄4 Cup (4 tbs)|
|Steak drippings/Butter / margarine||2 Tablespoon|
|Boiling water||1⁄2 Cup (8 tbs)|
|Worcestershire sauce||1 Teaspoon|
|Dry mustard||1⁄2 Teaspoon|
Saute onion in drippings 5 minutes.
Add remaining ingredients, except egg.
Cover pan, and simmer 10 minutes.
Just before serving steak, strain sauce, and pour slowly over beaten egg, beating constantly.
Cook sauce, stirring 1 minute over low heat.
Note: Prepare this sauce while steak is being broiled.