Pull away the outer greens from your cauliflower, and chop into rough florets. Chop any parts of the stalk roughly as well.
Place florets in a food processor, or high powered blender, and pulse until cauliflower represents a fine crumb, similar to couscous. You may have to re-pulse the stalk parts again.
Tip cauliflower rice into a bowl. Use raw in salads, or heat one teaspoon of olive oil in a fry pan and cook cauliflower until it has softened slightly. Season with salt and pepper and use as you would rice.