Make the chimichurri: In a food processor or blender, add all the ingredients and blend until smooth. Season with salt and pepper to taste. Set aside.
Drizzle the steak on both sides with oil. Season both sides with salt and pepper.
Preheat a grill or grill pan on medium heat. Grill the steak on both sides to the desired temperature using a thermometer (see below).Set the steak aside to rest for 3 to 5 minutes before slicing very thin against the grain.
Layer with lettuce, tomato, cheese, roasted peppers, steak, and sauce. Fold in the ends and roll up tight.
Cut in half and serve with chips, pickle, and kombucha.