In a large bowl, combine all marinade ingredients. Add pork collar butt steaks, ensuring all sides are evenly coated. Marinate the steaks in the refrigerator for at least 3-4 hours, or overnight.
Before grilling, bring the steaks to room temperature. Heat grill or cast iron pan to medium and brush with a light coating of oil. Grill the steaks on both sides. Using a basting brush, coat the steaks with the marinade each time you turn. Grill until steaks are cooked through and meat is lightly charred. Discard any leftover marinade.
Serve on a platter garnished with peppers and green onions.