Cut the plums in half. Roast nuts briefly in a cast-iron pan without fat, remove. For the dressing, heat 2 tablespoons of oil in the pan. Fry the plums for 2-3 minutes. Deglaze with vinegar and 4-5 tbsp. water, stir in honey and simmer for 3-5 minutes at medium heat. Season with salt and pepper. Decant the dressing and wipe out the pan.
Preheat oven (electric cooker: 100 °C/ circulating air and gas: not suitable). Pat meat dry. Mix miso paste and 1 teaspoon of sugar, spread on the steaks. Heat 1 tablespoon of oil in a frying pan. Fry the steaks on both sides over high heat for approx. 2 minutes. Place on a baking tray and continue to fry in the hot oven for 5-6 minutes.
In the meantime, sort out the rocket, wash and drain well. Wash and halve the cherry tomatoes. Peel and quarter the onion and slice or cut into very fine strips.
Take steaks out of the oven, let them rest for a short time, then cut them into thin slices. Mix rocket, tomatoes, onion and nuts with the lukewarm dressing. Arrange steak slices on top. If you like, sprinkle the salad with coriander leaves.