Pour 1/2 tablespoon of soy sauce on each side of the steak (1 tablespoon total).
Combine the seasonings in a bowl.
Sprinkle the seasonings on both sides of the steak. Place the steak in a Ziploc bag.
Add 1/2 tablespoon of soy sauce to the Ziploc bag. Seal the bag, removing all air.
Pat the outside of the bag to ensure added soy sauce saturates the meat.
Place in fridge to marinate at least 4-6 hours, preferably overnight.
Add the chopped veggies to a grilling tray. Grill for 4-5 minutes. Flip and turn the veggies to the other side. Grill an additional 2-3 minutes until soft.
Add the tortillas to the grill. Grill each side for about 1 minute.
Grill steak to preferred doneness (i.e. medium).
Melt 1 tablespoon of unsalted butter in the microwave for 30 seconds and stir. After the steak has reached the desired doneness, using a cooking brush, brush the butter onto both sides of the steak while it’s on the grill.
Remove the steak from the grill and allow it to cool for 5 minutes.
Place the steak horizontally on a cutting board, and slice steak into pieces.
Place the tortilla on a flat surface. Fill with the veggies, avocado, and steak. Serve!
Total cook time does not include time to marinate.