Meat juice
1 onion
1 tsp. mustard
1 c. tomatoes, chopped
1 or more cups water

Cook meat until done (hopefully, juices in pan are brown). Remove meat from pan. Strain excess grease out of pan (if desired). Slice 1 onion and cook it in drippings in pan until it's brown. Add 1 teaspoon of mustard. Chop up 1 cup of tomatoes. Add to pan. Let gravy cook awhile (about 10 minutes). Add about 1 cup of water and simmer another 5-10 minutes. Add more water if it has boiled away.