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Foods -- Vegetables
Why does cauliflower turn dark during cooking?
Colorless leucoanthocyanins turn purple as the vegetable grows. When these purple pigments are heated they may break down and cause a gray discoloration. Cauliflower also may turn dark in response to iron in the water or utensils. If you have problems with frozen cauliflower turning brown, use 2-3 tablespoons of lemon juice per gallon of water in the blanching water.