Wash potatoes thoroughly and cook in the preheated oven (circulating air: 175 °C/ gas: see manufacturer) for approx. 1 1/2 hours
Halve jalapeños lengthwise, clean, wash and fill with cheese. Cut ham slices crosswise into quarters and wrap jalapeños with a quarter each. Spread on a baking tray lined with baking paper. Place in the oven about 20 minutes before the end of the cooking time
Meanwhile wash the meat, dab dry and season with salt. Heat a large pan. Add oil in portions and fry the steaks one after the other for about 10 minutes, turning them over. Season the steaks with pepper and spread them on a fat pan. Remove potatoes from the oven and heat steaks in the oven at the same temperature for approx. 10 minutes
Cut the potatoes lengthwise. Open, carefully peel the potatoes from the skin with a fork. Add 1 tablespoon of butter to each potato, season with salt and mix gently with a fork. Remove steaks and jalapeños from the oven. Arrange potatoes, meat and jalapeños