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1
Preheat an oven to 325u00b0F.
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2
Using a chef's knife, very finely chop together the garlic, rosemary and sage. Transfer to a small bowl, add the fennel seeds, season with salt and pepper, and mix well. Make slits 1/2 inch deep all over the pork roast and insert some of the mixture into each slit. Rub the roast with the remaining seasoning, then rub with 2 Tbs. of the olive oil. Place the meat in a roasting pan just large enough to hold it.
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3
Transfer the pan to the oven and roast the meat for 1 hour. In a bowl, toss the onion slices with the remaining 2 Tbs. olive oil and scatter them around the meat. Continue to roast until an instant-read thermometer inserted into the thickest part of the roast, away from the bone, registers 150u00b0F, or the meat is pale pink when cut into at the center, about 1 1/4 hours more. Transfer the roast to a carving board, cover loosely with aluminum foil and let rest for 15 minutes before carving.
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4
Meanwhile, pour off most of the fat in the roasting pan and place the pan over medium-low heat. Add the wine and deglaze the pan, stirring to scrape up any browned bits from the pan bottom. Simmer until the sauce is slightly reduced.
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5
Carve the roast and arrange on a warmed platter. Spoon the pan sauce over the pork and serve immediately.
