Arrange Oven Rack In Lowest Position. Preheat Oven To 450 Degrees. In A Medium Bowl, Combine Horseradish, Vinegar, Lemon Juice, Syrup, 1/4 Tsp. Salt And 1/4 Tsp. Pepper. Stir Grated Apples Into Horseradish Mixture. Set Aside. Heat 12" Ovenproof Skillet On High. Pat Steaks Dry With Paper Towels. Sprinkle With 1/2 Tsp Each Of Salt And Pepper. Add Oil To Pan And Swirl To Coat Bottom Evenly. When Oil Shimmers And Is Almost Smoking, Add Steaks. Cook 2 Min. With Tongs, Lift Each Steak From Pan And Put Back Down On Same Side. Cook 1 Minute Longer, Then Turn Steaks Over. Transfer Pan To Lowest Rack Of Oven And Roast For 4 Minutes. Carefully Add Butter And Thyme To Skillet. Baste Steak With Melted Butter. Roast 2-3 Minutes Longer For Medium-Rare, Or Until Desired Done-Ness. Remove Pan From Oven And Baste Again. Transfer Steaks To Cutting Board And Let Rest 5 Minutes. Slice Steaks Against The Grain At An Angle. Spoon Steak Juices On Top And Serve With Apple Relish.