To make the Tomatillo Sauce: In a medium pot over medium heat place the tomatillos in water. Cook for about 5 minutes or until tender.
Place the cooked tomatillos and remaining ingredients in the food processor and process until smooth.
To make the Lemon Aioli: Blend all the ingredients and set aside.
To cook the beef: Mix the minced garlic, scallions, cumin, beer, oil salt and pepper together to make a marinade for the meat.
Rub the marinade on the steaks and let marinate for a bout 3 hours or overnight in the refrigerator.
Grill or broil the steaks over high heat to desired wellness, about 3 minutes on each side. Slice thinly across the grain of the meat. Now build your sandwich to your taste and enjoy!