Smashed Agrodolce-Inspired Onions

Preheat oven to 400°F. Coat a rimmed baking sheet with cooking spray.

Place onion halves on the prepared baking sheet. Drizzle with oil and sprinkle with 1/8 teaspoon each salt and pepper. Roast, turning once, until browned and tender, 25 to 30 minutes.

Meanwhile, combine vinegar, honey, raisins, crushed red pepper and the remaining 1/8 teaspoon salt in a small skillet; bring to a simmer over medium heat. Adjust heat to maintain a simmer and cook, stirring occasionally, until reduced to about 1/4 cup, 5 to 8 minutes.

Remove the onions from oven and discard any blackened onion layers. Flatten the onion halves using the bottom of a mason jar or sturdy glass. Drizzle with the sauce. Return to the oven until heated through, about 2 minutes more. Garnish with parsley, if desired.