Wash the cucumbers and radishes under cool running water. If desired, peel the cucumbers. Slice the cucumbers into thin rounds and cut the radishes into bite-sized pieces, set aside.

In a medium bowl, combine the whole grain mustard and honey. Whisk together for about 30 seconds until smooth and homogenous.

In a large bowl, add sliced cucumbers and radishes with chopped dill and chives. Pour the vinaigrette over the vegetables and gently toss until well-coated.

Cover the salad and let it chill in the refrigerator for about 30 minutes to meld the flavors. Toss again before serving.