01 - Combine the thinly sliced beef with soy sauce, olive oil, garlic powder, and black pepper in a bowl. Mix thoroughly and let marinate for 10 minutes.
02 - Heat a nonstick skillet over high heat. Add the marinated beef and cook for 2 to 3 minutes until browned and cooked through. Remove from heat and set aside.
03 - In a small bowl, whisk together Greek yogurt, mayonnaise, Dijon mustard, lemon juice, salt, and pepper until smooth.
04 - Lay out the lettuce leaves and spread a small amount of sauce evenly over each leaf.
05 - Distribute the cooked beef evenly among the lettuce leaves, followed by carrot, cucumber, and spring onion on top.
06 - Sprinkle sesame seeds and chopped cilantro over the fillings if desired.
07 - Roll or fold each lettuce leaf snugly around the fillings to form wraps. Serve immediately.