1Season the ribeye with salt, pepper, and 1 tbsp olive oil. Let it rest at room temperature for 15 minutes.
2Grate the pre-cooked potatoes and onion into a bowl. Add 1 tbsp softened butter, leaves from 2 thyme sprigs, salt, and pepper. Mix well and press into a flat rösti shape.
3Cut the bell peppers, zucchini, and eggplant into bite-sized cubes. Toss with remaining olive oil, minced garlic, leaves from 1 thyme sprig, and rosemary needles. Season with salt and pepper.
4Place the rösti and vegetable mixture in the air fryer basket or tray. Cook at 180°C (350°F) for 15 minutes.
5After 15 minutes, push the vegetables to one side and place the ribeye in the air fryer. Add the cherry tomatoes. Cook for another 8-10 minutes for medium-rare, or to your liking.
6Meanwhile, prepare the herb butter: finely chop leaves from 1 thyme sprig, 1 tarragon sprig, and 1 tbsp parsley. Mix with 75g (2.6 oz) softened butter. Season with salt and pepper.
7Let the steak rest for 5 minutes before slicing. Serve with the rösti, roasted vegetables, and a generous dollop of herb butter on top.