Summer Bean Salad

Ingredients

• 1 small red onion, finely diced
• 1/4 cup apple cider vinegar
• 2 teaspoons sugar
• 1/2 teaspoon kosher salt, plus more to taste
• 1/4 cup extra-virgin olive oil
• 1 (15-ounce) can white beans, drained and rinsed
• 3/4 pound green or wax beans, trimmed and halved
• 2 tablespoons fresh parsley, finely chopped
• 2 tablespoons fresh chives, finely chopped
• freshly ground pepper, to taste