Place steak in a plastic resealable bag with 2 tablespoons soy sauce. Marinate for 1 hour.
Grill marinated steak over medium-high heat, about 3-4 minutes per side. Transfer to plate and allow to rest for 10 minutes. Slice into bite size pieces and transfer to a bowl.
In a blender or food processor combine remaining tablespoon soy sauce, onion, garlic, peppers, pepper liquid and lemon juice. Process for about 30 seconds or until well blended.
Pour blended mixture over the top of sliced steak. Cover and refrigerate for at least 1 hour.