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Melt the butter in a Dutch oven or large saucepan over medium-low heat; add the chopped green onion and celery. Saute, stirring, until tender.
Warm the milk in another saucepan over medium heat.
Slowly stir in the warmed milk and continue cooking and stirring until thickened.
If desired, puree the soup in a blender or food processor** at this point and then return it to the saucepan.
Stir in the crab, shrimp, and the sherry. Bring to a simmer.
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