Clean and trim the excess fat and tissue from steak. The steak may need to be cut down to a size that will lay flat on the grill or cast-iron skillet.
In a glass or plastic bowl, combine the soy sauce, oil, lime juice, garlic, cilantro, Maggi seasoning and sugar. Place the clean steak in the marinade and let marinate 4 hours or overnight in the refrigerator.
Remove meat from the refrigerator and let sit out at room temperature for 20 minutes. Heat a grill or cast-iron skillet to high. Place the meat on the hot grill or skillet. Cook for 2 to 4 minutes a side. Place the meat on a cutting board and let rest.
Cut the steak into 2-inch thick pieces, then turn and cut against the grain. Sprinkle meat with salt and serve.