Combine butter with milk and brown sugar in 6 quart heavy saucepan; heat
over medium heat. Add salt and bring to a boil. Keep gentle boil and
constantly stir to avoid scorching until you reach the softball stage (when
small amount dropped from spoon in cold water forms a soft ball). Take off
heat. Cool 20 minutes, then beat in confectioners' sugar and vanilla with an
electric mixer beat until thick. Spread in 2 buttered 9 inch loaf pans.
Chill several hours.
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