Hearty Beef & Cabbage Stew

1 pound of ground beef
1 medium onion, chopped
40 ounce can of tomatoes
2 cups of water
15 ounce can of kidney beans
1 teaspoon of salt
1/2 teaspoon of pepper 
1 tablespoon of chili powder
1/2 cup of chopped celery
2 cups of thinly sliced cabbage