Three Bean Salad

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1/2 pound green beans, trimmed, cut in half crosswise

1/2 pound wax beans, trimmed cut in half crosswise

One 15-ounce can kidney beans, rinsed, and drained

1/2 small red onion, minced, soaked in cold water for 5 minutes and drained

1/4 cup sugar

1/3 cup cider vinegar

1/4 cup vegetable oil

1/2 teaspoon kosher salt plus more to taste

Freshly ground black pepper

1 tablespoon minced flat-leaf parsley