In a large skillet over medium heat, brown the ground beef until fully cooked, about 6-8 minutes.

Stir in the taco seasoning and a splash of water, cooking for another 2-3 minutes until well combined.

While the beef is cooking, warm the taco shells or tortillas in the oven according to package instructions.

Dice the tomatoes, shred the lettuce, and chop the cilantro.

Start assembling the tacos by placing a base of seasoned beef in each taco shell.

Add layers of shredded lettuce, diced tomatoes, and shredded cheese.

Top with a dollop of sour cream and sprinkle with chopped cilantro.

Serve immediately while warm.