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["If seasoning in advance, sprinkle 1 1/2 teaspoons salt and 3/4 teaspoon black pepper over the entire surface of the roast, and refrigerate, uncovered or loosely covered, for 24 to 28 hours. Let the roast sit at room temperature for 1 hour before roasting.", "Heat the oven to 450u00b0F (425u00b0F convection) with a rack near the center. Choose a shallow roasting pan (or baking dish) just large enough to accommodate the roast, and outfit it with a flat roasting rack. (You can also improvise a roasting rack by crumpling a long piece of foil into scrunch it into a rope shape; bend the ""rope"" into a spiral or ""S"" shape to set the roast on.)", "Place the roast on the rack, and smear the surface with butter. Slide it into the oven, and roast until you hear a good sizzle, about 15 minutes. Immediately, pour 1/2 cup room-temperature water into the bottom of the pan, and lower the oven heat to 275u00b0F (250u00b0F convection), and continue to roast until an instant-read thermometer inserted in the center of the roast reads 115u00b0F for very rare, 120u00b0F for rare, and 125u00b0F for medium-rare, another 55 to 70 minutes. With top sirloin, I don't recommend roasting beyond medium-rare.", "Transfer the meat to a carving board, preferably one with a trough, and leave to rest for 20 to 30 minutes. Skim any excess fat from the drippings, and taste. They should be salty, but tasty. Keep warm to serve with the beef.", "Carve the roast across the grain, snipping the strings as you go, and drizzle a bit of pan juices over the top before serving.", "In a small bowl, whisk together the yogurt (or creme fraiche), mustard, and lemon juice. Season lightly with salt to taste."]
