Royal icing, for decorating
3 ounces Unsweetened chocolate, melted in a double boiler
1 teaspoon Instant espresso powder, dissolved in 1/2 teaspoon boiling water
1 teaspoon Vanilla extract
1 Large egg
1 cup Superfine sugar
8 teaspoons Unsalted butter, slightly softened
1/2 teaspoon Salt
1/4 tablespoon Baking soda
1/2 teaspoon Baking powder
2 tablespoons Sifted Dutch-processed cocoa powder
1 1/2 cups All-purpose flour