Green Beans with Caramelized Onion

You are getting a flurry of new recipes because we've been trying a lot of them. Here is another yummy recipe. I was iffy on it due to the brown sugar, but it is just right. The original recipe uses fresh green beans and I've included that information at the bottom. This recipe is from Southern Living: All Time Favorites c. 2009 p. 321

Green Beans With Caramelized Onion

2 pounds green beans, frozen
2 large sweet onions
3 tablespoons butter, divided
3 tablespoons light brown sugar
1 1/2 tablespoons balsamic vinegar

1. Place beans in casserole dish and heat on high for 20 minutes or until tender.
2. Meanwhile, cut onions into thin slices, and cut each slice in half.
3. Melt 1 tablespoon butter in a large nonstick skillet over medium-high heat, and add onion; cook 8-10 minutes (do not stir). Continue cooking onion, stirring often, 15 to 20 minutes or until golden. Reduce heat to medium; stir in remaining 2 tablespoons butter and brown sugar.
4. Add green beans, and cook 5 minutes or until thoroughly heated. Add vinegar; toss to coat.

Makes 8 servings.

If using fresh green beans, prepare as follows: Trim beans. Cook beans in boiling water to cover 12 to 15 minutes or until tender. Drain and set aside, or cover and chill overnight if desired.