Lightly spray a frying pan with oil and heat on medium. Cook onion for 3 minutes, stirring, until soft. Cool slightly. Combine with lamb mince and tandoori paste in a bowl. Season with pepper. With wet hands, shape mince mixture into 12 patties.
Cook rice in a large saucepan of boiling, salted water according to packet directions. Drain and keep warm.
Meanwhile, heat a frying pan on medium and cook lamb patties for 3 minutes each side, until cooked through. Combine yogurt and coriander in a bowl. Season to taste. Cook beans in a saucepan of boiling, salted water for 3 minutes, until tender but still crisp.
Serve lamb patties with rice, beans and yogurt sauce.