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Heat the grill to high. Toss the onion with half the lemon juice, plus some seasoning, and set aside.
Using your hands, mix the mince with 3 tsp of the garam masala and some seasoning. Divide the mix into 6, then roll each into a long thin sausage. Insert a skewer along the length of each kofta, then grill for 5 mins each side until cooked through. If using wooden skewers, soak them for 10 mins first.
Make the raita as the lamb cooks. Mix together the yogurt, apple, beetroot, the remaining garam masala, the lemon juice and some seasoning. Serve the koftas with the onions, raita, lemon wedges, coriander leaves and cooked rice or wraps.