Mix the miso, mirin and oil together in a small bowl. Place the figs and aubergines on a baking tray and spoon over the mirin mixture. Stir to coat the figs and aubergines in the oil and sprinkle with the sesame seeds. Roast for 20 minutes.
For the vinaigrette, cover the raisins in hot water. Leave to soak until the raisins are plump and then drain thoroughly. Whisk the oil, sherry vinegar and capers together in a small bowl and stir in the raisins.
Place the pitted dates in a blender and add a small amount of water. Blend until a smooth paste is formed, adding more water if needed.
To serve, spoon some date purée onto two plates. Spoon over a little of the caper and raisin vinaigrette. Add some roasted figs and aubergines on top and scatter over the Medjool dates. Dress the rocket and watercress with the remaining vinaigrette and add this to the plates. Sprinkle over the pine nuts and serve immediately.