01 - Combine the thinly sliced beef with soy sauce, olive oil, garlic powder, and black pepper in a bowl. Mix thoroughly and allow to marinate for 10 minutes.
02 - Heat a nonstick skillet on high heat. Add the marinated beef and cook for 2 to 3 minutes until browned and just cooked through. Remove from heat and set aside.
03 - In a small bowl, blend Greek yogurt, mayonnaise, Dijon mustard, lemon juice, salt, and black pepper until smooth.
04 - Arrange the lettuce leaves on a flat surface. Spread a small amount of sauce onto each leaf.
05 - Distribute the cooked beef evenly over the sauce-covered lettuce. Top with julienned carrot, cucumber, and sliced spring onions. Optionally sprinkle sesame seeds and chopped cilantro.
06 - Roll or fold the lettuce leaves around the filling to enclose it. Serve immediately for best freshness.