1 very large (14- to 16-ounce) red onion, peeled, halved lengthwise, sliced lengthwise
1 tablespoon chopped fresh marjoram
1/2 teaspoon dried crushed red pepper
1/3 cup red wine vinegar
2 tablespoons (packed) dark brown sugar
Directions
Steam beans until crisp-tender, about 5 minutes. Transfer to plate.
Melt butter in heavy large skillet over high heat. Add next 3 ingredients. sauté until onion begins to soften, about 2 minutes. Add vinegar and sugar. Stir until sauce thickens, about 1 1/2 minutes. Add beans; toss to coat and heat through, about 1 minute. Season with salt and pepper. Mound in shallow bowl.
