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1
In a medium saucepan, bring 2 cups cider, 1/3 cup salt, brown sugar, torn bay leaves, cloves and peppercorns to a boil. Remove from heat, stir in 2 cups each water and cider; cool to room temperature.
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2
Place pork loin in a 2 gallon resealable plastic bag and pour cooled brine mixture over. Allow meat to brine, refrigerated for at least 8 hours or up to 1 day.
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3
Preheat oven to 350u00b0F Finely chop garlic, 1 sprig rosemary and remaining bay leaf. Add remaining salt and ground pepper; mash into a paste with the flat side of a knife.
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4
Remove pork from brine (discard liquid), pat dry, and rub with garlic-herb mixture. Place in large roasting pan and scatter apples and onions around it. Break remaining rosemary sprig into 4 pieces, scatter atop apples and onions. Transfer pan to oven and roast meat until internal temperature reaches 160F, about 1 hour, 15 minutes. Transfer pork loin to serving platter with all but 4 pieces each apple and onion. Allow meat to rest 15 minutes before serving.
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5
Meanwhile, place roasting pan with drippings, reserved onions and apples on stove top over medium heat and add remaining 1 cup cider plus 1 cup water. Cook, scraping browned bits from bottom of pan until liquid is hot, about 2 minutes. Strain mixture into bowl, pressing liquid from solids; set aside. Return roasting pan to stove top and melt butter over medium-high heat. Sprinkle in flour and whisk until golden brown. Whisk in reserved cider mixture and continue to whisk until gravy is smooth. Serve hot with pork roast.
