There is something magical about the combination of crunchy (and sweet) green beans and the zingy horseradish dressing. I like this with the thin, elegant (and often pricey) haricots verts beans or regular, larger string beans. If you see yellow wax beans or even romano beans, they can be mixed together or individually in this salad. You can let this salad chill up in the fridge for several hours before eating. It's a good dish with anything from grilled steak to roasted vegetables.