In a large mixing bowl, cream butter and sugar. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Combine flour and baking soda; add to creamed mixture alternately with buttermilk, beating well after each addition (batter will be thick).
Pour into a greased and floured 10-inch fluted tube pan. Bake at 350 degrees for 45–50 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely.
For icing, in a small saucepan, combine the butter, brown sugar and cream. Bring to a boil over medium heat, stirring constantly. Remove from the heat; cool for 5–10 minutes. Whisk in confectioners’ sugar. Drizzle over cake.
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