Carefully mix the mango with all the other ingredients up to and including the salt, refrigerate.
In a bowl, combine the lime juice with all the other ingredients up to and including the sesame oil, mix well. Add the tofu, toss in the marinade, cover and marinate in the fridge for approx. 1 hr.
Remove the tofu from the marinade and pat dry. Brush the spring onions with the remainder of the marinade.
Grill the tofu over/on a medium heat (approx. 200 °C for approx. 10 mins. on each side. After 3/4 of the cooking time, add the spring onions and continue to grill, turning occasionally. Combine the dukkah spice mix and sesame seeds, serve with the tofu.