Cut florets from the top of the cauliflower until you have a cauliflower 'bowl'.
Remove greens from bottom. Cut stems from radishes, leave the root which will look like an optic nerve, and remove skin but leave a little to resemble blood shot eyes/veins.
Hollow out the cut end of the radish with the tip of a knife so to stuff with olive. Use a toothpick to hold everything together.
Line your "bowl" with aluminum foil or a clear cling wrap so dip doesn't escape.
Fill cauliflower with dip, garnish with radish 'eyes', pepper nose and onion mouth, and serve with veggies and crackers.