This green bean salad with mustard vinaigrette is a refreshing and flavorful side dish. The crisp green beans are blanched to perfection and then tossed in a tangy mustard vinaigrette. The vinaigrette is made with Dijon mustard, red wine vinegar, olive oil, and a touch of honey for sweetness. The salad is finished off with some chopped red onion and fresh parsley for added flavor and color. It's a simple and healthy salad that is perfect for summer picnics or as a light lunch.