Parisian Three Bean Salad

This is from my 365 Ways to Cook Vegetarian cookbook. Posting for ZWT3.

• Ready In: 20 mins
• Serves: 4

Ingredients

• 1⁄4 lb  thin green beans
• 10  ounces frozen baby lima beans, thawed
• 1⁄2 cup olive oil
• 2  tablespoons tarragon vinegar
• 1  teaspoon Dijon mustard
• 1  garlic clove, minced
• 1⁄2 teaspoon sugar
• 1⁄4 teaspoon salt
• 1⁄4 teaspoon pepper
• 1 (15 ounce) can cannellini beans, rinsed and drained
• 1  large sweet onion, sliced thin
• 1  tablespoon chives, chopped

Directions

1. In a medium saucepan filled with boiling water, cook green beans and lima beans until green beans are crisp-tender, 2-3 minutes. Drain and rinse under running water. Set aside to cool.
2. In a small bowl, make dressing by whisking together olive oil, vinegar, 1 tablespoon of water, mustard, garlic, sugar, salt and pepper until well blended.
3. In a serving bowl, mix green beans and lima beans with cannellini beans and sliced onion.
4. Toss with dressing. Sprinkle with chives. Serve at room temperature.