Porcini-Rubbed Beef Rib Roast
['1/3 cup dried porcini mushrooms (about 1/2 ounce)', '2 tablespoons kosher salt', '1 tablespoon whole black peppercorns', '1 teaspoon marjoram or oregano leaves', '1 (4-rib) bone-in rib roast (about 10 pounds)', 'Flaky sea salt and Horseradish-Yogurt Sauce (for serving; optional)']
Pulse mushrooms, kosher salt, peppercorns, and marjoram in a spice mill or mini food processor until coarsely ground. Pat meat dry, then rub mushroom mixture all over. Transfer to a wire rack set inside a rimmed baking sheet. Let sit at room temperature 1 hour (for even more flavor, chill, uncovered, overnight, then let sit at room temperature 1 hour before roasting).
Preheat oven to 225°F. Roast meat until an instant-read thermometer inserted into the center registers 120°F (for medium-rare), about 4 hours. Tent with foil and let sit at room temperature at least 30 minutes and up to 1 hour.
Increase oven temperature to 500°F. Remove foil and roast meat until browned and crisp, 5–10 minutes. Immediately transfer to a cutting board. Cut off ribs in 1 piece, then slice into individual ribs. Carve roast into 1/2" slices and arrange on a serving platter along with ribs. Season with sea salt and serve with Horseradish-Yogurt Sauce, if desired.
Rub can be made 1 day ahead; store in an airtight container at room temperature.
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