I've said before that pork chops are about the easiest thing you can grill. The biggest problem with chops is overcooking them no matter how they are cooked. This goes back to the old myth of pork, that it has to be cooked to death to be safe to eat. Truth is that pork is now considerable "cleaner" than it once was due to efforts of the National Pork Board and the pork producers. Now you want to get pork to a temperature around 155 degrees F. (68 degrees C.) before you take it off the grill. Remember to let it rest for 5 minutes before serving so that the chop finished cooking and the juices redistribute. With chops I find that time is the best way to determine doneness. For pork chops 3/4 inch thick your cooking time should be 8 to 10 minutes total, 4 to 5 minutes per side with your grill hot. If your chops are thick (1 1/2 inches) the grilling time should be 12 to 16 minutes (6 to 8 minutes per side). So watch the clock and avoid overcooking your chops. You'll enjoy them much more if they are grilled right.
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