Drain the tofu, wrap in a kitchen towel and press gently to remove excess water. Unwrap, pat dry and slice into cubes.
Heat sesame oil in a large pan set over medium-high heat. Add the tofu to the pan and let cook for a minute, before turning over. Cook until lightly browned, about 3 minutes. Add the green beans and chilli flakes, frequently stirring for about 3-4 minutes, until the beans are crisp-tender.
In a cup, stir the tamari, vinegar and honey; then drizzle over the tofu and beans. Stir and toss to coat, then transfer to serving bowls. Sprinkle with peanuts to serve.