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Crush the fennel seeds and red pepper flakes in a mortar and pestle.
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Transfer to a bowl, and add the sea salt, black pepper, and paprika.
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Stir to combine and then rub over both sides of the steak.
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Set aside at room temperature for 30 minutes.
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Meanwhile, prepare a gas or charcoal grill for high indirect heat. Clean the grill grates.
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Drizzle the steak on both sides with a little olive oil.
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Sear the steaks directly over the fire until nicely charred and grill-marked, turning once or twice and with the grill covered when not turning, about 10 minutes total.
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Using grilling tongs, transfer the steaks to the cooler side of the grill. Use a meat thermometer to check the temperature; 130F is medium rare.
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Remove from the grill and let rest, lightly covered with foil, for 10 minutes before serving.
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Slice against the grain and serve.
Tips for Success:
- You can also use bone-in ribeye steaks, in which case increase total weight to 2 1/2 lbs.
- As a substitute for a mortar and pestle, place salt and spices in a bowl, and crush with a ladle. Another option is to place the mixture in a plastic bag, and roll with a rolling pin.