Brown lamb in a hot non-stick skillet until quite crispy. Drain off most of the fat. Add garam masala and salt and toss well.
Combine shallots, lemon juice, ginger, salt in a large bowl. Toast cumin seeds in a hot, dry skillet. Grind with a mortar and pestle or spice grinder. Add to dressing. Add olive oil and pour dressing over carrots. Add coriander and mint and toss well. Serve on top of hot lamb and sprinkle with sesame seeds.