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1
Heat oven to 325u00b0F.
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2
Wash ribs and pat dry with paper towels. Set on rimmed baking sheet or in a large roasted pan. Place mustard, onion powder, garlic powder, allspice powder, chili powder, cayenne, Lowry's seasoned salt, salt and pepper in a gallon-sized re-closable plastic bag, or a pizza spice shaker container, and shake vigorously to mix well. Pour half seasoned rub mixture onto one side of the ribs and massage into flesh. Turn ribs over and pour the remaining rub mixture onto other side of ribs and massage into flesh. Cover ribs fully with a large sheet of heavy duty tin foil, rolling edges of foil under and into baking sheet to make an air proof seal. I leave them in the frige overnight to merinate well. I don't know if this is what makes them so tender, but they are! Place in oven and cook for 3 hours.
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3
Remove from oven, carefully unseal foil - keep your hands and face a way from the hot steam. Heat grill to high. Place barbecue sauces, brown sugar, garlic, liquid smoke and cider vinegar into a medium-sized sauce pan, stir to combine. Using a large pastry brush, baste generously with sauce. Place sauce over medium-high heat, bring to a boil, then lower heat to medium and cook for 5 minutes. Remove from heat and set aside. Place ribs on grill and cook, about 4-6 minutes a side, 8-12 minutes total.
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4
Remove to a cutting board, cut into 2-3 rib portions, place on serving platter and serve with remaining barbecue sauce on the side.
