Place all of the ingredients except half-and-half and one tablespoon of the butter in the top part of a double boiler over boiling water. Don't let the top pan touch the water. Whisk briskly and constantly for about 1 minute, until oysters are just beginning to curl. Add half-and-half and continue stirring briskly, just to a boil. DO NOT BOIL. Serve piping hot topped with the remaining 1 T. butter and sprinkled with paprika. Note: To make more servings, do 2 at a time. Have bowls hot, and heat half-and-half before adding.