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Pat lamb dry and score fat by making shallow cuts all over with tip of a sharp small knife.
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Pound garlic to a paste with sea salt using a mortar and pestle (or mince and mash with a heavy knife) and stir together with rosemary and pepper.
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Put lamb in a lightly oiled roasting pan, then rub paste all over lamb.
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Let stand at room temperature 30 minutes.
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Preheat oven to 350°F.
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Roast lamb in middle of oven until an instant-read thermometer inserted 2 inches into thickest part of meat (do not touch bone) registers 130°F, 1 1/2 to 1 3/4 hours.
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Transfer to a cutting board and let stand 15 to 25 minutes (internal temperature will rise to about 140°F for medium-rare).
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Add wine to pan and deglaze by boiling over moderately high heat, stirring and scraping up brown bits, 1 minute.
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Season pan juices with salt and pepper and serve with lamb.