Make the herb garlic butter: add the 3 softened sticks of butter to a stand mixer fitted with the paddle (or use a hand mixer) and whip on high until light and fluffy, about 5–7 minutes.
Stir in 1 tablespoon minced rosemary, 2 tablespoons minced thyme, 1/4 cup sliced green onions, 2 finely minced garlic cloves, the zest and juice of 1 lemon, 2 teaspoons coarse salt, and 1/2 teaspoon pepper until evenly combined; set aside.
Prep the fries: place the batonnet-cut russet potatoes in cold water and agitate with your hands to remove excess starch; drain, rinse, and drain well.
Blanch the fries: heat oil in a deep fryer or pot to 300°F (about low-medium) and fry the potatoes for 3 minutes until just softened but not browned; remove with a slotted spoon and spread on a parchment-lined sheet tray to drain and hold.
Finish the fries: when ready to serve, increase oil temperature to 350°F and fry the potatoes 3–5 minutes more until golden brown and crispy; drain, toss with coarse salt to taste, and keep warm.
Season the steaks on both sides with coarse salt and pepper.
Cook the steaks: heat 2 tablespoons olive oil in a large skillet over high heat until smoking. Add the strip steaks and immediately lower heat to medium. Press the steaks with tongs or a spatula for 15–20 seconds, then let cook untouched for 2–3 minutes.
Flip the steaks, add 8–10 sprigs of thyme, 8–10 garlic cloves, and 4 tablespoons unsalted butter to the pan. Cook 2–4 minutes while continuously basting the steaks with the melted butter.
Transfer the steaks to a cutting board and rest for 3–4 minutes before slicing. Serve sliced steaks with a spoonful of the herb garlic butter and the fries.