From Gooseberry Patch Seasons for Sharing.
In a saucepan, combine egg yolks, milk, sugar, and nutmeg; heat and stir constantly over medium heat until mixture coats a metal spoon.
Remove from heat and place pan in a bowl of ice water.
Stir for 2 minutes; mix in cream and vanilla.
Cover and plastic wrap and chill at least 4 hours, or up to 24 hours.
Place blackberries in a large glass pitcher; pour nog on top.
Serve immediately.
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