Drain pineapple and reserve juice. Salt and pepper pork chops to taste.
In a small sauce pan, combine pineapple juice, water, brown sugar and mustard and bring to a light boil. Reduce heat and stir in lemon juice, Worcestershire sauce and corn starch mixture. Simmer for 3 minutes until thick, stirring constantly.
Brush sauce on pork chops and place on a prepared grill. Brown pork chops for 2 minutes on each side, brush on more sauce and top with pineapple rings. Cook for 2-3 more minutes and turn so pineapple rings are on grill and get the nice grill marks.
Cook for 2-3 more minutes.
Flip once more, baste with sauce, and check doneness of pork chops. Allow to rest for 5 minutes and then serve.