Score both sides of the steaks. A crosshatch pattern allows the salt and marinade to penetrate the meat and looks nice when grilled.
Generously pre-season both sides of the steaks with Diamond Crystal Kosher Salt. Allow the steaks to sit for 10-15 minutes while the salt dissolves.
Meanwhile, mix together marinade. Add olive oil, lime juice, soy sauce, garlic, onion and AlbuKirky Seasonings Garlapeño Rub in a blender canister. Blend until pureed and smooth. Place steaks into a gallon sized ziplock bag. Pour in marinade. Seal the bag and massage the marinade into both sides of the steaks. Place bag on a sheet pan and refrigerate for a minimum of 4-hours and up to overnight.
Remove the steaks from the fridge about 1/2 hour before grilling. Remove the meat from ziplock bag and shake off excess marinade. No need to pat dry.
Since the steak is less than 1 inch thick, cook it hot and fast over a hot grill, flipping every 2-minutes until a nice char has developed on the exterior.
The steak is done when the thickest part reaches an internal temp of 130° (*see note). Remove the steak from the grill and allow it to rest 10-15 minutes before slicing against the grain and serving.