Combine 1/2 cup butter with 1/4 cup cocoa and 1 cup water in saucepan. Bring mixture to a boil, mixing well. In a separate bowl, combine flour, sugar and 1/2 teaspoon salt. Pour boiling mixture over dry ingredients. Add 1/2 cup buttermilk, eggs, baking soda, 1/2 cup baby food plums and 1 teaspoon vanilla, mixing well. Pour into greased and floured jelly roll pan. Bake at 400 degrees for 20 minutes. While brownies are baking, combine 1/4 cup cocoa and 1/2 cup butter and 1/3 cup buttermilk in saucepan. Bring to a boil, blending well. Remove from heat and add remaining powdered sugar and 1 teaspoon vanilla. Mix until creamy. Frost brownies immediately upon removing from oven. Sprinkle chopped nuts on top for a garnish.
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