When considering nutrient preservation, which cooking method is generally recommended over boiling for kale to retain water-soluble vitamins?
Steaming
The method used to prepare kale significantly influences the final nutritional content available to the consumer, particularly concerning water-soluble vitamins. While lightly sautéing may slightly reduce Vitamin C, steaming is designated as the superior cooking technique for preserving the overall nutritional profile when compared directly to boiling. Boiling, especially when the cooking water is discarded, leads to a substantial leaching of water-soluble vitamins into the liquid that is then thrown away. Steaming, conversely, minimizes this leaching process, thus ensuring a higher concentration of these essential nutrients remains within the kale leaves themselves.

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Kale: Benefits of a superfood powerhouse - Mayo Clinic Health System