Prep: 1. Peel, pit and cut peaches. 2. Slice half the onion, chop the other half and the parsley. 3. Put peaches, sliced onions, vinegar, 2 tablespoons water, 1 tablespoon of the mustard, sugar, 1/4 teaspoon of the salt and 1/4 teaspoon pepper into a pot and bring just to a boil over medium-high heat. 4. Reduce heat to medium low and simmer, stirring occasionally, until liquid is thickened and peaches are tender and just starting to fall apart, 5-7 minutes. 5. Transfer peaches to a bowl and set aside to let cool. (If there seems to be too much liquid, drain if needed.) Make: 1. Prepare a grill for medium-high heat cooking, oiling the grill grates if necessary. 2. In a bowl, combine pork, chopped onions, parsley and remaining 1 tablespoon mustard. Form the mix into 4 patties. 3. Brush patties all over with oil then season with remaining salt and pepper. 4. Grill burgers, flipping once, until deep golden brown and cooked through, ~10 minutes total. 5. Divide spinach between pita halves then tuck one burger into each half. Spoon pickled peaches into pitas and serve.
This might seem a little out of the ordinary but is so delicious!