Season the meat with the garlic powder, cumin and salt and pepper to taste. Heat the oil in a large frypan over medium high heat. Add the meat and saute for 5 to 10 minutes or until browned on all sides.
Add the flour, stirring well, and saute for 1 more minute. Gradually add the water, making sure to crush any flour lumps. Then add the onion and green capsicum, reduce heat to low and simmer for 15 to 20 minutes. Season with salt and pepper to taste.