Add the honey and mix inches Adjust this to your tastes. It is generally lightly sweet and rounds out the flavors of the mayo and yogurt.
Add the poppy seeds, mix in (if you don't have seeds, don't sweat it, they give a bit of texture but I have wanted this salad and run out and it is fine without it -- )
Either mix the spinach, sliced water chestnuts and mandarin oranges, or make this directly on the plate. I usually break the water chestnuts because about a 1/2 slice and one mandarin orange plus a fork full of spinach leaves seems to be about perfect.