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1
make the mop Light a grill.
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2
In a large bowl, combine all of the mop ingredients and whisk until smooth.
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3
prepare the ribs Season the ribs all over with salt and pepper.
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4
Layer two 18-inch sheets of foil on a work surface and set a half rack of ribs in the center; pull the edges of foil up around the ribs.
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5
Spoon 3/4 cup of the mop over the rack and seal tightly in the foil.
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6
Repeat with the remaining 3 racks.
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7
Grill the rib packets over moderate heat, covered, for 45 minutes.
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8
Using tongs, transfer the rib packets to a baking sheet and let cool slightly.
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9
prepare the ribs Meanwhile, transfer the remaining mop to a medium saucepan and bring to a boil.
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10
Simmer over moderately low heat, stirring constantly, until reduced to 1 cup, 12 to 15 minutes; let cool completely.
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11
prepare the ribs Wrap the wood chips in a double layer of foil and poke holes in the top of the packet.
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12
Remove the grill grate.
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13
Turn the heat off on half of the grill or rake the coals to one side.
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14
Set the wood chip packet directly on the flames or on the coals and replace the grill grate.
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15
When the chips are smoking, carefully open the rib packets and arrange the racks on the grill over indirect heat.
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16
Discard the foil and juices.
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17
Cover the grill and smoke the ribs until the meat is very tender, 1 hour.
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18
Brush the ribs with the reduced mop, transfer to a platter and serve.
