Grilled Pork with Nectarines

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1/2 cup apple cider vinegar

1/3 cup sugar

1 tablespoon whole-grain mustard

2 wide strips lemon zest (removed with a vegetable peeler), plus the juice of 1 lemon

2 large nectarines, chopped (about 2 cups)

1 large fennel bulb, cored and sliced 1/4 inch thick

1 red onion, sliced 1/2 inch thick and separated into rings

1 red onion, sliced 1/2 inch thick and separated into rings 

3 tablespoons extra-virgin olive oil, plus more for the grill

Kosher salt and freshly ground pepper

1/2 cup roughly chopped fresh parsley

4 boneless center-cut pork loin chops (3/4 to 1 inch thick; about 1 1/2 pounds), trimmed