Recipe(tried): Raspberry-Glazed Pork Chops-alterations

This is what I made for Friday nite dinner. It was good, however, the sauce never got to the 'glaze consistency'. I'd like to make it again, but I'd like the sauce to be more thick and gooey. More jam, less jam? Less vinegar? Adding brown sugar or cornstarch or flour?????? Any suggestions?????? Please write back!!!!

Raspberry-Glazed Pork Chops

Prep Time: 10 mins. Ready In: 25 mins.

1 tsp. butter or margarine
4 boneless pork chops, about 3/4 inch thick (1-1/4 lb.)
1/2 cup seedless raspberry jam
1/3 cup raspberry or balsamic vinegar
1/4 cup Dijon mustard
1 tsp. grated orange peel
1-1/2 tsp. chopped fresh thyme leaves HEAT butter in large skillet on medium-high heat. Add chops;
cook on both sides about 5 to 7 minutes or until browned.

MIX remaining ingredients; add to skillet.

SIMMER, uncovered, until sauce is reduced to a glaze consistency
and chops are tender, about 5 minutes, turning chops frequently.____________________________________________________________