For the steak, remove meat from the refrigerator about 2 hours before roasting. Then dab the steak dry. Heat 2 tablespoons of oil in a large frying pan. Sauté the steak in it for about 2 minutes on each side. Season with salt and pepper and place on a baking tray. Cook in a preheated oven (electric cooker: 120 °C/circulating air not suitable/gas: see manufacturer) for approx. 30 minutes.
For the potatoes, peel, wash and dice the potatoes. Wash the pimientos de padrón. Heat 2 tablespoons of oil in a large frying pan. Fry the potatoes for about 15 minutes until crispy, turning them several times. Add the pimientos and fry for about 5 minutes. Season with salt and paprika powder.
Peel and chop the garlic. Mix with mustard and honey. Take the steak out and spread with the mustard mixture. Turn the temperature up (electric cooker: 230 °C/circulating air: 210 °C/gas: see manufacturer). Gratinate the steak in a hot oven for about 5 minutes. Remove from the oven and leave to rest for approx. 5 minutes.
For the sour cream, wash the chives and cut into small rolls. Mix with sour cream, yoghurt and mayonnaise. Season to taste with salt and pepper. Arrange everything.