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different quantities - the 1 lb (500g) cauliflower is a guideline, but anywhere from 14 oz (400g) to 21 oz (600g) will be fine.
different vegetables - broccoli works really well. You can also replace up to half the cauliflower with grated raw carrot, beets, sweet potato, parsnip or zucchini.
different seeds - use sunflower seeds, chia seeds or pepitas (pumpkin seeds).
no seeds - skip the whole seeds and use almond meal (flour) instead of the ground flax.
other flavors - add some grated Parmesan, garlic or chopped herbs.
Keeps in the fridge for a week or so. Or freeze and warm slices in the toaster as needed.