38+ Brown Spots On Cauliflower. The culprit for this discoloration is oxidation, which happens naturally the longer cauliflower is stored. This is a physical issue, not a sign that a harmful microbe has moved in.
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Cauliflower is baked in a rich cheese sauce and topped with an extra sprinkling of cheddar cheese creating the perfect cauliflower au gratin side dish. A scattering of pale brown spots on the cauliflower curds isn't all that abnormal, and it doesn't necessary mean it's time to ditch that newly purchased veggie. Avoid choosing a head that has brown spots or loose sections that are spread out. The cause of brown skin spots is when the upper layer of the skin (epidermis) has a basal layer, which contains pigment cells containing melanin that gives color to the skin.