Step 1Rice the cauliflower. To do that, run the cauliflower florets through a hand grater or food processor with a grating blade. Pulse until the florets resemble grains of rice.
Step 2Slice the onion, bell peppers and celery. Dice the zucchini into small 1 cm (1/2 inch) pieces. Halve the tomatoes and mince the garlic.