Mix the soy sauce, olive oil and 2 ounces of the tequila together in a small container and shake until well mixed. Put steak into Ziplock bag, pour in marinade, and marinate at room temperature for 1 hour. Drain the steak, discarding the marinade.
Mix the remaining ingredients in a small bowl. Apply to both sides of the meat, rubbing in well with your hands.
Place steak on grill over hot mesquite fire (600 degree to 700 degree), and cook until you reach the desired state, approximately 6-8 minutes per side for medium-rare. Place meat on a platter and drizzle the extra tequila over both sides of the steak just before serving.
Do not pour liquor over the meat while it is over or near an open flame unless you want to be an ignited part of the barbecue yourself!