Marinate steak in lime juice, cumin, and garlic powder for 30 minutes.

Grill or pan-sear steak over high heat for 3-4 minutes per side.

Let meat rest for 5 minutes, then slice thinly against the grain.

Warm tortillas on the grill or in a dry pan.

Dice onion and chop cilantro for toppings.

Assemble tacos with meat, onion, cilantro, and salsa verde.