Step 1Heat the oven to 350 degrees. Lightly grease a 9-inch square baking pan.
Step 2Melt the chocolate and butter or margarine over low heat. Cool to room temperature. Stir in the sugar, brown sugar, vanilla sugar, salt, eggs, cake meal and potato starch. Fold in 3/4 cup of pecans.
Step 3Spoon the batter into the prepared pan. Bake until the top seems set and is beginning to take on a crackled appearance, 35 to 40 minutes. Do not overbake. The brownies should be set and seem dry to the touch-but there should not be a dry crust around the sides.
Step 4To garnish, drizzle the melted chocolate over the brownies. Coarsely chop the remaining pecans and scatter them over the top.