In a medium sized bowl, combine the yoghurt, mint leaves and lemon juice and set aside. Pour the macadamia dukkah onto a large plate, reserving 2 tablespoons.
Thread the prawns, tail end first, onto the bamboo skewers. Roll each prawn in the macadamia dukkah*, place in a single layer on a large tray and lightly brush both sides with macadamia oil.
Preheat a chargrill on a medium heat. Cook the prawns on the grill, turning constantly to prevent burning, for 3 to 4 minutes or until the prawns change to a deeper orange colour.
Remove from the heat, place on a serving platter and sprinkle with the reserved macadamia dukkah. Serve with the minty lemon yoghurt and lemon wedges.