To make the glaze, mix all the ingredients together in a medium bowl along with 100ml/3½fl oz water.
To make the tofu, add the steaks to the glaze, cover and allow to marinate overnight.
When ready to cook, place a griddle pan over a high heat until hot. Drain the tofu, reserving the glaze. Chargrill the tofu in the griddle pan for a few minutes on each side.
To make the crispy kale, preheat the oven to 200C/180C Fan/Gas 6.
In a large bowl, toss the kale with the sugar, seaweed, sesame seeds, Chinese five-spice powder, oil and salt. Bake in the oven for 12 minutes or so until crisp, then mix through the cashew nuts.
Meanwhile, heat the remaining tofu glaze in a small saucepan.
Serve the tofu steaks on serving plates with the kale on the side and the glaze spooned over.
