Preheat the oven to 190°C (375°F) and line two baking trays with plastic-free baking parchment. To make the miso dressing, place the miso paste, rice vinegar, mirin, tamari and honey in a blender and blend until smooth. Set aside.
Place the aubergine halves, cut side up, on one baking tray. Brush with sesame oil and once absorbed, brush with half of the miso dressing. Roast for 30-35 minutes, or until golden and soft.
Place the salmon fillets on the other baking tray, skin-side down. Brush the remaining miso dressing over the salmon. Add to the oven with the aubergine for the last 12-15 minutes of cooking time, or until cooked through.
Meanwhile, heat the sesame oil in a frying pan over a medium heat. Add the Cavolo Nero and stir fry for 3-4 minutes until visibly wilted but still crunchy.
Divide the Cavolo Nero between serving bowls and top with a piece of miso-roasted salmon and half an aubergine. Sprinkle with sesame seeds to serve.