Peel, wash and roughly dice the potatoes, cover and cook in a little salted water for about 20 minutes. Wash, clean and cut the sugar snap peas into strips.
Dab meat dry and season with salt. Heat oil. Fry the meat on each side for about 3 minutes. Season with pepper, take out and let it rest for about 8 minutes wrapped in aluminium foil.
Meanwhile, peel the onions, cut them into slices and fry them in the frying fat for about 2 minutes. Add the Teriyaki sauce, bring to the boil and stew everything covered for about 3 minutes.
Heat 1 tablespoon of butter. Steam sugar snap peas in it for about 5 minutes. Season with salt and pepper. Drain potatoes with 2 tablespoons butter, milk and herbs. Season to taste with salt. Add steaks to the sauce.
Dress everything.