In small food processor, add cilantro, garlic, jalapeno, and lime juice.
Pulse until finely chopped
Add olive oil and salt, and puree.
To make the steak:
Pat steak dry and season with salt and pepper.
If you have extra time, marinate the steaks in about half of the pesto for 30 minutes to 1 hour.
Preheat grill to medium-high heat.
Grill steaks until desired doneness is attained.
Once steaks are done, grill the tortillas for about 1 minute on each side.
Slice steaks, against the grain, into slices for your tacos, and then toss in the cilantro pesto. If you used some to marinate, you will need less to toss it in, and be sure to leave a little for topping the tacos.
Place steak pieces in charred tacos, then top with additional pesto and preferred toppings.
Enjoy!