Season the steaks with the PW Steak Rub.
Heat a cast-iron skillet over high heat. Add some butter and let it sizzle and start to brown. Fry the steaks for 1 minute per side. Serve.
Heat a skillet over medium heat until hot. Toast the coriander, fennel and mustard seeds until aromatic, 2 to 3 minutes. Grind in a spice grinder until finely ground, then add to a bowl. Add the sugar, garlic powder, onion powder, salt, black pepper and red pepper flakes and mix to combine.