The best way to rice cauliflower is by using a food processor. Fit the food processor with the chopping blade or a shredding attachment. I use the standard blade that came with my food processor. Load the bowl of the food processor with 1/3 head of cauliflower that has been washed and roughly chopped. Process it for 5 seconds on high speed. Empty the bowl and repeat two times to completely rice a full head of cauliflower. A medium size head will produce 6 cups of riced cauliflower.