Usually it is better not to remove outer leaves from fruits and vegetables before storage. Without the leaves, food can become dry.

通常在存储前最好不要清除水果和蔬菜外面的叶子，没有这些叶子，食物会变得干燥。

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The cut greens are hard to wash, and you can't remove outer leaves as you can with a head of romaine.

FORBES: Don't Eat Your Spinach

The first recipe, inspired by chef Nobu Matsuhitsa, uses only the outer leaves of the sprout, ensuring full flavor without the risk of under- or overcooking.

NPR: Turning a New Leaf on a Misunderstood Sprout

First, discard the outer leaves and trim off their nubs.

WSJ: Paul Kahan's Shaved Brussels Sprout Salad With Burrata | Slow Food Fast