Sprinkle both sides of steak evenly with salt; wrap tightly with plastic wrap and place in 1 gal ziplock bag squeezing out excess air. Refrigerate for 3-24 hr.
One hour prior to grilling fill large pot or bowl with 1 gal warm water (about 100 deg). Place ziplock bag in water and weight to keep under water.
20 min. prior to grilling light fire. When coals lit build 2 level fire by arranging coals on 1/2 of grill. Position grate over coals, cover grill, and heat until hot, about 5 min.; scrape grate clean with grill brush.
Remove steak from water and unwrap; brush both sides with oil and sprinkle evenly with pepper.
Grill over coals, flipping steak with tongs once every minute, until dark brown crust forms on both sides, about 8 min.
Move steak to cooler side of grill, cover grill, continue cooking until instant-read thermometer inserted into center reads 120 deg., about 3 min., flipping steak half way through cooking time.
Transfer to cutting board and let rest tented with Al. foil about 10 min. Slice very thinly at 45 deg. angle to meat.