Heat 1 1/2 to 2 inches oil in a deep frying pan over medium heat to 325 F degrees. Cut potatoes into thin slices lengthwise. Cut each slice into thin shoestring strips. Place cut potatoes on paper towels. Place 2 generous handfuls of potatoes at a time into hot oil, in 2 batches. Par cook the potatoes 2 minutes and transfer to a towel lined plate. Raise heat to medium high up to 375 degrees F. Allow oil to rise to a higher temperature, 3 to 5 minutes. Return potatoes to oil in 2 batches to crisp them, cooking them to a deep, golden brown color, another 2 to 3 minutes per batch. Remove potatoes from oil to clean towels to drain. Season with fine salt and serve.
For steaks, heat a large nonstick skillet over high heat. Add a little oil to the pan, 1 turn. Season steaks with salt and pepper. Place steaks in skillet and sear 2 minutes on each side. Reduce heat to medium and cook steaks 6 minutes longer for medium rare, 8 for medium to medium well. Remove steaks to a warm plate to rest. Add 2 tablespoons butter and the shallots to the pan. Cook shallots 2 or 3 minutes, add flour to the pan and cook a minute longer. Whisk wine into pan and lift pan drippings up. Add the last tablespoon of butter and remove the pan from the heat. Spoon wine and shallot sauce over the steaks and serve with hot, shoestring potatoes.