Green Beans And Roasted Red Onions

Really good side dish from bon appetit.

Put oven rack in middle position and preheat oven to 450f oil a 13- by 9-inch baking pan.

After peeling onions , trim root ends , leaving onions whole , then quarter onions lengthwise.

Put onions in baking pan , then drizzle with oil and vinegar , tossing to coat.

Arrange onions with a cut side down and sprinkle with salt and pepper.

Roast , uncovered , turning over once and basting with pan juices twice during baking , until deep golden , about 30 minutes.

Add water to pan and roast until onions are tender and caramelized , about 20 minutes more.

Transfer onions with pan juices to a large bowl.

While onions are roasting , cook beans in a 5- to 6-quart pot of boiling salted water , uncovered , until crisp-tender , about 5 minutes.

Drain beans in a colander , then add to onions and toss.

Season with salt and pepper.

red onions, olive oil, balsamic vinegar, kosher salt, black pepper, water, green beans