Ingredients

3 tablespoons white-wine vinegar

1 tablespoon olive oil

Coarse salt and ground pepper

1 pound green beans, trimmed and cut diagonally into 1-inch pieces

1 can (15.5 ounces) cannellini beans, drained and rinsed

1/2 cup minced red onion

Shaved Parmesan cheese, for serving (optional)

Preparation

In a large bowl, whisk together vinegar and oil; season with salt and pepper. Set aside.

Cook green beans in a pot of boiling salted water until crisp-tender, about 4 minutes. Drain in a colander; pat dry with paper towels.

Add warm green beans, cannellini, and red onion to dressing in bowl; season with salt and pepper. Toss well. Serve, garnished with Parmesan, if desired.