Combine chocolate and butter into a bowl and cook over double boiler until smooth and thick. Cool and set aside.

Combine eggs and sugar gradually, creaming well. Blend cocoa powder and vanilla, stirring well. Slowly mix into creamed chocolate mixture until batter is smooth and well blended.

Pour into prepared cake pan. Bake for 30 minutes or until top springs back when lightly touched. Cool.

To serve, we can cut into wedges and dust with icing sugar. We can decorate each slice with strawberry on top.