For 9 X 13 cake. Prick cake surface with fork, while cake is still warm.
Combine butter, milk & cocoa in large heavy sauce pan.
Bring to boil - stirring constantly.
Stir in sugar.
Return to boil - stirring constantly. As soon as it comes to boil, remove from heat.
Add vanilla - stirring 3 minutes.
Quickly put on cake.
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