Place cauliflower chunks in a food processor and pulse until broken into rice-size pieces.
Heat a deep pan or wok over medium heat. Add olive oil (and butter if using). Add brown rice and cook for 1-2 minutes until heated through, add cauliflower 'rice', cumin or spice of choice, salt and pepper. Keep stirring for 1 more minute. Fluff 'rice' with a fork and serve.
Additions when cooking brown rice: Add whole cloves, star anise, cinnamon bark, pink peppercorns, coriander seed, cardamom seed, bay leaf, curry leaf etc. These will add their own, gentle unique flavour.
Add fresh chopped herbs at end. Any of the following are good: coriander, dill, parsley, mint, basil, chives just before serving
Add stir-fry vegetables, or prawns or chicken (stir-fry separately and toss in with rice).