This recipe has been passed down the generations in our family. We usually have it every year on Christmas Eve. Since it's so rich we only serve it with ice water to drink and a simple salad. Delicious and very satisfying.
Add milk, butter and oysters with their juice to a double boiler or a large pot that fits inside of another pot. Fill the bottom pot as full of water as you can without it running over.
Add a little celery salt, salt and pepper and then heat on low. Cook very slowy so the milk won't boil (I start at 1 pm. for dinner at 6 pm). Every now and then stir. After a few hours, do a taste test to adjust seasonings.