Texas Hash

1 to 1 1/2 pounds lean ground beef
3 tablespoons vegetable oil
2 onions, chopped
1 large green bell pepper, chopped
1 (14.5 ounce) can diced tomatoes, undrained
1 cup regular rice, uncooked
1 cup water
1 tablespoon chili powder
2 teaspoons salt
1/8 teaspoon black pepper

In a large skillet, saut