You can boil, bake , steam, roast, or puree sweet potatoes but the cooking method that retains the most nutrients is roasting.

你可以煮，烤，蒸，或把土豆做成土豆泥，但是保留最多营养的烹调方法是烘烤。

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That means roasting the vegetables until they are smoky and sweet, and toasting the almonds to deepen their nutty taste.

WSJ: Jos�� Andr��s's Romesco With Asparagus Two Ways | Slow Food Fast