In a pot, place the flank steak, water, onion, scallions, garlic, salt and pepper. Cook over medium-low heat for about 2 hours or until the meat is tender.
Remove the beef from the pot and set aside
To make the sauce: In a saucepan, place the oil, tomatoes, red bell pepper, onions, scallions, garlic, achiote, cumin, salt and pepper. Cook for 6 to 8 minutes, stirring occasionally.
To serve: Place the cooked flank steak on a plate and drizzle with the creole sauce.