How to Make It
Place the steaks on a platter and let stand at room temperature for 45 minutes. Meanwhile, in a medium bowl, using a hand mixer, beat the stick of butter at medium speed until light and fluffy. Beat in the togarashi, lime zest and juice and 1/4 teaspoon of kosher salt. Keep the togarashi butter at room temperature while you cook the steaks.
Melt 1 1/2 tablespoons of the butter in each of 2 large cast-iron skillets over moderately high heat. Season the steaks generously with kosher salt. When the butter has stopped foaming, add 1 steak to each skillet and cook undisturbed until deeply browned on one side, about 6 minutes. Flip the steaks and add 1 tablespoon of butter to each pan. Continue cooking, basting frequently with butter, until the steaks are well browned on both sides and an instant-read thermometer inserted into the thickest part registers 125° for medium-rare, 7 to 9 minutes longer. Transfer to a cutting board, cover with foil and let rest for 10 minutes.
Spread half of the togarashi butter on each steak and sprinkle with flaky salt. Thinly slice the steaks across the grain and serve with lime wedges and crusty bread.