Green beans with sweet and sour onions

Serves 6

Ingredients:

1 lb.      Green beans, trimmed
3 tbsp   Butter
1           Large red onion, peeled, halved lengthwise, sliced lengthwise
1 tbsp   Chopped fresh marjoram 
1/2 tsp   Dried crushed red pepper
1/2 cup   Red wine vinegar
2 tbsp     Dark brown sugar

1. Steam beans until crisp-tender, about 5 minutes. Transfer to plate.
2. Melt butter in heavy large skillet over high heat.
3. Add next 3 ingredients. 
4. Sauté until onion begins to soften,about 1 1/2 minutes. 
5. Add beans; toss to coat and heat through, about 1 minutes
6. Season to taste with salt and pepper. 
7. Mound in shallow bowl.