Depending on how much dressing you prefer to use on the beans, you will likely have some extra vinaigrette leftover after dressing the salad. Save this in the fridge for use the following day. It tastes great with lettuce and is delicious when mixed with your choice of raw and roasted vegetables.
While the flavors of this salad remain wonderful the next day, the shallots lose their crispy texture in the fridge after being mixed with the green beans and dressed. You can always make extra crispy shallots and save them in an air-tight plastic container for use in future meals.