Preheat Smoker: to 160 degrees (we used cherry wood).
Season Ribeye Steak: Coat the steaks with olive oil and then season the steak liberally.
Smoke Steak: Place ribeye on the smoker, and cook 30-45 minutes, or until the internal temperature (IT) reaches 110 degree. Remove from the smoker and prepare for the grill for high heat.
Grilling: Prepare your cooker for direct heat. In this case we used a simple kettle grill. Once the grill is HOT, place the steak over the hot direct heat for about 2 minutes at the most, then flip and cook another two minutes or until the steak reaches your desired the internal temperature (we aim for 125 - 130 degrees). Remove, let rest a couple minutes, then slice into thin strips.
For the Tacos:
Warm up your corn tortillas.
Load up the tortillas with a couple slices of the steak, a drizzle of chimichurri sauce, an avocado slice, and any other additional toppings.