|Ground beef||1 Pound|
|Chopped onion||125 Milliliter|
|Condensed chicken gumbo soup||1 Can (10 oz) (284 Milliliter)|
|Prepared mustard||1 Tablespoon|
|Hamburger buns||2 , split and toasted|
In 1.5 L (1 1/2 quart) shallow glass dish 25 x 15 x 5 cm (10 x 6 x 2 inches), combine beef and onion.
Cook in microwave oven 6 to 8 minutes, stirring twice; pour off fat.
Blend in soup and mustard.
Cook 3 minutes or until hot.
Stir before serving on buns.