How to Make It
With a slotted spoon, remove the oysters from their liquor. Strain the liquor through a sieve lined with cheesecloth. In a medium saucepan, melt 4 tablespoons of the butter over moderate heat. Add the fennel and cook, stirring occasionally, until the fennel is tender, about 5 minutes.
Add the milk, cream and 1/2 teaspoon of the salt. Bring to a simmer, stirring constantly.
Reduce the heat to low, add the oysters, the reserved oyster liquor and the Worcestershire sauce and bring just to a simmer, stirring constantly. Simmer just until the oysters plump and begin to curl, about 1 minute. Do not boil or the cream will curdle. Taste and add 1/4 to 1/2 teaspoon salt if needed. Stir in the remaining 2 tablespoons butter. Serve sprinkled with the paprika and chopped fennel tops.