-
Combine butter, 1/4 teaspoons salt, tarragon, and lemon rind in a bowl.
-
Stir vigourously with a fork.
-
Coat a cast iron skillet with cooking spray and heat over medium-high heat.
-
Sprinkle steak with remaining salt and pepper and cook for 5-7 minutes per side, depending on thickness and desired degree of doneness.
-
Let steak rest 3-5 minutes on a carving board then cut across on the diagonal, into thin strips.
-
Drizzle meat with the butter and serve.