The next time you're cooking bacon, whatever you do, don't toss the fat! Instead, let it cool down in the pan, then strain it through a coffee filter into an airtight container. Stash it in the refrigerator and use a few tablespoons to baste steak on the stovetop to impart richness and a subtle bacon-y flavor.
Remove the steak from the refrigerator 30 minutes before cooking.
Heat a large heavy-bottomed skillet over medium-high heat. Pat the steak dry and season generously with kosher salt and pepper on all sides. Stand the steak up on the strip of fat in the skillet and hold it with tongs until the fat renders and the skillet is slick, about 2 minutes.
Place the steak flat in the skillet and sear until deep brown on one side, 4 to 5 minutes. Turn and cook the other side until starting to brown, 2 to 3 more minutes. Reduce the heat to low. Add the rosemary and garlic to the skillet and spoon the bacon fat over the steak. Continue cooking, tilting the skillet every so often and spooning the bacon fat up over the top of the steak, until a thermometer inserted sideways into the thickest part registers 120 degrees F for medium rare, about 1 minute.
Transfer to a cutting board and let rest 10 minutes. Slice the steak against the grain. To serve, spoon the rosemary-infused bacon fat over the slices and sprinkle with flaky salt.
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