Step 1

Sprinkle pork with salt and pepper. Heat oil in a large skillet over medium-high heat. Add the pork and cook, turning once, until browned, about 2 minutes per side. Reduce heat to medium and continue cooking until an instant-read thermometer registers 140 degrees F, 3 to 5 minutes more. Transfer the pork to a plate and tent with foil.

Step 2

Add onions and thyme to the pan; cook, stirring often, for 1 minute. Add broth and water; cover and cook for 5 minutes. Uncover and cook, stirring often, until the onions are soft and most of the liquid has evaporated, about 5 minutes. Stir in raisins and vinegar, scraping up any browned bits. Bring to a boil. Cook until thickened, about 3 minutes. Remove from heat and stir in butter. Serve the pork with the sauce, topped with parsley.