Ingredient:

• 4 teaspoons sugar
• 1/2 cup butter, cubed
• 4 ounces semisweet chocolate, chopped
• 1 cup confectioners' sugar
• 2 large eggs, room temperature
• 2 large egg yolks, room temperature
• 1-1/2 teaspoons instant coffee granules
• 3/4 teaspoon vanilla extract
• 6 tablespoons all-purpose flour
• 1/2 teaspoon salt
• Optional: Whipped cream or additional confectioners' sugar