Cook ground beef and onion, until beef is brown and onion tender.

Stir in water, catsup, mustard, salt and pepper. Bring to boil.

Stir in rice, bring back to boil. Cover, remove from heat. Let stand 5 minutes. Fluff with fork. Sprinkle with cheese. Let stand 3 minutes for cheese to. Melt.

Can garnish with shredded lettuce, sliced tomatoes.