Steps
1. In a bowl, mix the ground beef, egg, chopped onion, salt, and pepper. Form the mixture into small kofta shapes.
2. Heat a pan over medium heat and cook the koftas until browned and cooked through.
3. Toast the bread slices.
4. Assemble the sandwich by placing the cooked koftas and cucumber slices inside the bread.
5. Serve hot and enjoy!