Prepping the Cauliflower:
since the cauliflower is bunched up it is possible that they may carry some caterpillars inside the florets. To avoid this choose a cauliflower with separated florets so you can see as much as possible. After washing and removing the excess leaves and cutting of the additional stalk, pour some hot water on the cauliflower and rinse again.
Alternatively, dunk the cauliflower head in salted water that is on a rolling boil and leave it in for 5 minutes. Drain carefully, this should remove most caterpillars hiding in them.
Now I have omitted this step as I don’t see any of the caterpillars in the cauliflowers here.