Add the cauliflower florets to the food processor bowl making sure it's not packed.
Press the "pulse" button on the food processor to break down the pieces further.
Continue to pulse the cauliflower until it's chopped into a size you like.
Option 2: Use a grater.
Just like grating cheese, slide the florets up and down the box grater. This leaves you with perfect rice-sized pieces but will take a little bit longer than busting out your food processor.