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Tip the tofu into a medium bowl. In a separate bowl, mix together the garlic, ginger, miso, honey or agave, the lime juice, soy sauce and sesame oil. Pour this over the tofu, toss gently to combine, cover and chill overnight to marinate.
The next day, thread the tofu and spring onion pieces alternately on four large, metal skewers. Light the barbecue and wait until the coals are ashen, then cook the skewers for 4-5 mins on each side until slightly charred. Alternatively, cook under a hot grill for 5-8 mins on each side until golden. Sprinkle over the sesame seeds before serving.