
Few dishes command a dinner table quite like a thick, bone-in Porterhouse cooked the Florentine way — seared hard over screaming heat until a deep mahogany crust locks in every drop of juice. The ingredient list is refreshingly short: a great cut of beef, kosher salt, black pepper, olive oil, and a couple of rosemary sprigs draped over the top while it rests. That simplicity is exactly what makes this recipe so naturally free of the legume-based flours and additives that can sneak into more processed or restaurant-style preparations. A cast iron grill pan does the heavy lifting here, building that crackling exterior on all sides — including the fat cap — without any coatings or marinades to worry about. A squeeze of lemon and a pinch of flaky sea salt at the table brighten the richness and make every bite feel intentional. Rest it properly, slice against the grain, and arrange it on a platter with the bone for a presentation that looks far more impressive than the effort required.
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Remove the steak from the refrigerator and pat it completely dry with paper towels. Season all surfaces — including the sides — generously with the kosher salt and black pepper. Let the steak rest at room temperature for 30 to 45 minutes.
Heat a cast iron grill pan over high heat for 4 to 5 minutes, until the surface is smoking. Brush 1 tbsp of the olive oil over both flat sides of the steak.
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