Pork Loin With Mustard Sauce and Sautéed Squash

INGREDIENTS

2 tbsp

olive oil

1 1/2 lb

boneless pork loin

kosher salt and black pepper

1/4 cup

red wine vinegar

1/4 cup

Dijon mustard

1/4 cup

coarsely chopped fresh flat-leaf parsley

small onion, cut into 1-inch pieces

zucchini and/or yellow squash, cut into 1-inch pieces