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In a medium bowl, whisk together the orange juice, vinegar, shoyu, oils, garlic, ginger and red pepper flakes. Separate the pressed tofu pieces and place them in a baking dish in a single layer. Cover with marinade and sprinkle with the spring onions and coriander. Cut the stems off the chillies, remove seeds and place the chillies in the baking dish. Marinate for at least 30 minutes, and up to overnight.
Preheat the oven to 180C/350F. Pour off some of the marinade so the tofu is covered halfway. Bake for 40-45 minutes, without turning, until the tofu is golden and most of the marinade has been absorbed.