Preheat the broiler thoroughly. It should be very hot. Adjust the rack up to its highest position. Season steaks with course salt and pepper and let them sit at room temperature while you make the butter. In a small bowl, blend together the butter, half the lemon zest, lemon juice, parsley, tarragon and ½ teaspoon salt. Set aside until needed. Broil the steaks until they are done to your liking, about 3 minutes per side for a medium-rare 8-ounce, 1 1/4-inch thick steak. Adjust time for size of steak and desired doneness. Cover steaks with foil and let them rest. While the steaks are resting, steam asparagus or cook in boiling salted water until tender. Arrange a steak and some asparagus on each of 4 plates. Top the steaks with lemon-herb butter, sprinkle the asparagus with lemon zest, and serve.
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