In a bowl or plastic bag, mix all the ingredients for the Beef Marinade above. Make sure to stir in the brown sugar last and slowly so that it evenly dissolves. Season the flanked short ribs with a little bit of sea salt. Put beef in the marinade, mix it around for an even coating, cover it, and place in the refrigerator for 4-8 hours (you can do up to 24 hours - the longer the better).
About 15 minutes before cooking, pull beef out of the refrigerator and take out of marinade. Let come to room temperature.
Use some Cowboy Hardwood Lump Charcoal to light fire and let burn for 10-15 minutes. Once charcoal is white hot, push into one flat pile for direct grilling.
Grill the short ribs for about 4-5 minutes per side. Pull off and let rest for 5 minutes once done.
Sprinkle some sliced green onions on top, serve & enjoy!