Prepare the potatoes by peeling and cutting them into even chunks.
Boil the potato chunks in salted water until tender, about 15-20 minutes.
Drain the potatoes and let them steam for a few minutes to remove excess moisture.
Preheat the oven to 425°F (220°C).
Toss the boiled potatoes with olive oil, salt, and pepper.
Spread the potatoes onto a baking sheet and roast for 25-30 minutes, flipping halfway through.
While the potatoes roast, season the steaks with salt and pepper.
Heat a skillet over medium-high heat and add olive oil.
Sear the steaks for about 4-5 minutes on each side for medium-rare, adjusting time for desired doneness.
In the last minute of cooking, add garlic, butter, and rosemary to the skillet.
Remove the steaks from the skillet and let them rest for 5 minutes before slicing.
Serve the steaks alongside the roasted potatoes, garnished with additional herbs if desired.