Start by marinating the meat with olive oil, salt, and pepper for at least 30 minutes.
Preheat your grill or skillet over medium-high heat.
Grill the marinated meat for about 5-7 minutes per side, or until cooked through.
Remove the meat from heat and let it rest for 5 minutes.
While the meat rests, warm the corn tortillas on the grill for about 30 seconds on each side.
Dice the grilled meat into small pieces.
Assemble the tacos by placing a portion of meat on each tortilla.
Top with diced onions and chopped cilantro.
Squeeze fresh lime juice over the tacos.
Serve with salsa on the side for added flavor.