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1
Make the sauce: Bring all ingredients except plums to a boil.
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2
Stir in the plums. Reduce heat and simmer very slowly until thick and syrupy, about 45 minutes.
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3
Depending on your preference for consistency, either puree in small batches in the blender, blend with a stick blender, or mash with a potato masher.
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4
The sauce may be made two days in advance. It will make more than you need, and you might find yourself tempted to dip an eggroll in it, or serve it with goat cheese.
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5
Fire up your grill. Bank the coals on one side, so that one half is very hot, and one half can be used for indirect cooking. If you have a gas grill, this is much easier.
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6
Pat pork tenderloins dry. Lightly salt and pepper all over.
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7
On the hottest part of the grill, brush a little oil or spray with PAM so the pork won't stick. Sear the pork on all sides.
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8
Move the pork to the indirect heat, brush liberally with some plum sauce, and cover the grill for about 8-10 minutes. Total cooking time, including searing is 15-18 min. If you have a thermometer, cook to 155.
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9
Heat some plum sauce in a small saucepan on the stove.
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10
Remove the pork from the grill and tent with foil, allowing the meat to rest for 5-10 minutes.
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11
Slice the tenderloins. Pool the plum sauce on the plate, and serve with four or five slices of tenderloin fanned on top. I usually serve this with garlic-y greens or baby bok choy and rice.
