- 2 pounds green beans, trimmed
- 2 red onions, peeled
- 4 teaspoons olive oil, divided
- 1/4 teaspoon salt
- 1/4 teaspoon black pepper
- 2 sprigs fresh thyme
- 1 tablespoon chopped fresh dill
- 3 tablespoons Champagne vinegar or white wine vinegar
- 1 tablespoon stone-ground mustard
- Preheat oven to 400 degrees F.
- Cook green beans in boiling water 5 minutes. Drain and plunge beans into ice water; drain. Place beans in a large bowl.
- Cut onions in half vertically. Drizzle cut side of each onion half with 1/4 teaspoon oil. Sprinkle halves evenly with salt and pepper. Place 1 thyme sprig on 1 onion half; top with other half. Wrap in foil. Repeat procedure with remaining thyme and onion halves. Bake wrapped onions at 400 degrees F for 1 hour or until tender. Cool to room temperature. Discard thyme; chop onions.
- Combine remaining 1 tablespoon olive oil, onions, dill, vinegar, and mustard in a small bowl. Toss beans with onion mixture.