In a large skillet over medium heat, add a splash of olive oil and wait for it to shimmer. Toss in the finely chopped onion and sauté for about 3-4 minutes until they turn translucent and soft.

Add the ground beef to the skillet with the cooked onions, season with salt and pepper, and cook for 6-8 minutes until browned and fully cooked.

In a mixing bowl, combine the Greek yogurt and minced garlic, stirring until smooth. Add lemon juice and season with salt.

Slice the pita bread open to create a pocket. Fill with the cooked beef mixture and fresh vegetables.

Drizzle the lemon garlic yogurt sauce inside the pita over the filling and serve immediately.