Here's the reason you cut an X in the bottom of brussels sprouts

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The key to cooking Brussels sprouts is in not overcooking them. The leaves cook

faster than the core, so cut an X in the bottom of the stem for even cooking

when cooking the sprouts whole. As a rule, when Brussels sprouts have lost the

bright green color, they are overcooked and have lost a considerable amount of

nutritional value as well. Depending on size, cooking time should not exceed 7

to 10 minutes weather you are steaming, braising or boiling. Select sprouts of

even size for uniform cooking. Large sprouts should be cut in half.