This crunchy salad is dressed with a bracing vinaigrette.
If radishes are 1 ounce each or larger, cut them into eighths; quarter smaller ones. Place in a bowl. Scrub Jerusalem artichokes well. Use a small knife to trim off any bad spots, but do not peel. Slice the Jerusalem artichokes in half lengthwise, then crosswise into thin pieces. Add to radishes; add all remaining vegetables. Toss to combine.
In a small bowl, combine vinegar, salt, pepper, and thyme. Gradually whisk in olive oil. Pour vinaigrette over salad; toss well. Let stand at room temperature for about 1 hour before serving.