Start with soft, room-temperature butter. Using a stand mixer, whip the butter on high for about 5–7 minutes until light and fluffy. Add in your chopped rosemary, thyme, green onions, garlic, lemon zest, and lemon juice. Season it with salt and black pepper. Mix it all until everything looks evenly blended. Set it aside or keep it in the fridge until you’re ready to use.
Wash and peel the potatoes, then cut them into thin matchsticks. Soak them in cold water for at least 10 minutes to remove excess starch (this helps them crisp up). Drain and pat them very dry. Heat oil in a deep fryer or pot to 300°F. Fry in batches for about 3 minutes—they’ll be pale but slightly soft. Remove and rest them on a tray with parchment paper. Increase the oil to 350°F and fry again for 3–5 minutes until beautifully golden. Toss with salt immediately.
Season the steaks generously with salt and pepper. Heat olive oil in a large skillet over high heat until it starts to smoke. Carefully place the steaks in the pan, reduce heat to medium, and sear for 2–3 minutes. Flip the steaks, then add garlic, fresh thyme, and butter. Spoon the sizzling butter over the steak as it finishes cooking, another 2–4 minutes depending on your preferred doneness. Let the steak rest for 3–4 minutes before slicing.
Arrange your crispy fries beside the juicy steak. Top the steak with a generous spoonful of lemon herb butter—it’ll melt right into the meat. For a final touch, sprinkle flaky sea salt or fresh herbs over the top. It looks and tastes like a bistro meal!