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1. Arrange rack to centre; preheat oven to 375u00b0F (190u00b0C).
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2. Cut racks into sections, usually halves, to fit in a single layer in a 10 x 15-inch (4-L) dish or large roasting pan or oven-broiling pan bottom. Arrange meaty-side down. Pour broth over ribs; snugly cover dish with aluminum foil. Bake 1 hour.
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3. Remove ribs from pan to cool; drain off all pan juices. Ribs can be made ahead to this point, covered and promptly refrigerated for up to 2 days. (Save strained juices, covered in refrigerator or freezer. Use to add excellent flavour to roast pork gravy, spaghetti sauce or lentil soup.)
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4. Line a large baking pan (with sides) with foil for easy cleanup. Increase oven temperature to 425u00b0F (220u00b0C).
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5. Stir rub ingredients together. Dry ribs with paper towels. Sprinkle and press spices into meaty areas, putting only a slight amount on the bony side. Now turn bony-side up to easily cut into single ribs.
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6. Prop meaty-side-up single ribs against each other in foil-lined pan. Bake uncovered for 30 to 35 minutes (15 to 20 minutes longer if ribs have been refrigerated) or until sizzling and browned. Drain fat from pan.
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7. Meanwhile, stir molasses with ketchup, garlic, mustard and vinegar. Slather meaty tops with a third of sauce. Bake ribs, uncovered, for 5 minutes. Then turn ribs on side and baste again; bake 5 minutes. Finally turn ribs to other side and baste with remaining sauce; bake 5 minutes or until glazed.
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8. Pile onto a heated platter.