In a large bowl, combine ground beef, bread crumbs, chopped onion, minced garlic, cumin, coriander, cinnamon, cayenne, salt, and black pepper. Mix thoroughly until all ingredients are well incorporated.
Shape the meat mixture into evenly sized small meatballs or oval koftas, about 1 inch in diameter.
Heat a large skillet over medium heat and cook the koftas for 8-10 minutes, turning frequently until browned and cooked through.
While the koftas cook, prepare the cucumber sauce by mixing Greek yogurt, grated cucumber, minced garlic, fresh dill, lemon juice, salt, and pepper in a bowl. Stir until smooth.
Warm the pita pockets in the oven or skillet until soft and pliable.
Fill each pita pocket with 3-4 koftas and spoon a generous amount of cucumber sauce inside.
Serve immediately with extra cucumber sauce on the side if desired.
Notes
This recipe makes a flavorful and easy Middle Eastern meal perfect for lunch or dinner. The cucumber sauce adds a cooling contrast to the spicy koftas.