Green Beans With Caramelized Red Onions - cooking recipe

Ingredients

6 tablespoons olive oil
1 1/2 lbs red onions, thinly sliced
1 lb fresh green beans, trimmed
1 1/2 tablespoons balsamic vinegar
3/4 teaspoon dried tarragon

Preparation

Heat 3 tablespoons oil in heavy large skillet over medium-high heat.
Add onions; saute until deep brown, about 35 minutes.
Season with salt and pepper.
Cook beans in medium pot of boiling salted water until just crisp-tender, about 4 minutes.
Drain; rinse under cold water until cool, then pat dry.
Whisk remaining 3 tablespoons oil in vinegar and tarragon in large bowl to blend.
Add beans and onions and toss to coat.
Season with salt and pepper.
Serve warm or at room temperature.