1/4-1/2 tsp. grated lemon zest, according to taste
1 tsp. minced shallot
Salt and freshly ground black pepper, to taste
Steam beans 5 minutes or until tender but still crisp.
While beans cook, in a large mixing bowl, use a fork to combine mustard, lime juice and salt, mixing until creamy. Mix in mint, lemon zest and shallots.
Drain cooked beans and add to the mustard mixture, stirring to coat them. Season to taste with salt and pepper. Serve at room temperature. This dish can be refrigerated for 24 hours. Bring to room temperature before serving.
Frozen whole green beans may be used, although they will be less crisp than fresh ones. For frozen beans, reduce cooking time to 3 minutes.