Season steaks with salt and pepper.
In large sauté pan, heat oil until it begins to smoke. Sear steaks until golden brown on all sides. Remove steaks from pan.
Add chiles, onion and garlic cloves and sauté for 1 minute. Add water and sugar and bring to boil, cook for an additional 5 minutes. Remove ingredients from pan and puree.
Return steaks and pureed chile mixture to the pan. Cover with lid and cook on low heat for 40 minutes or until tender, adding water if necessary.
Serve the steaks covered with sauce and garnish with green onion slices. Add rice or steamed vegetable as side, if desired.