Peel and finely chop the onion. In a large bowl, mix the lamb and beef, add the spices, finely chopped onion and coriander. Mix well until blended.
Take a small amount of mince and roll it between the palms of your hands to form a ball. Set aside and repeat until all the mixture is used.
Prepare the yoghurt sauce. Mix all the ingredients in a bowl and season to taste. Drizzle with olive oil before serving. Set aside.
Preheat the plancha to high heat. Pour a little vegetable oil on the plancha and cook the keftas over medium heat until golden brown on all sides.
Toast the pine nuts and almonds on the plancha. Add the semolina and raisins and cook for a few more minutes. Serve the semolina with the keftas and yoghurt sauce.