Black and White Cookies

INGREDIENTS

• 1/3 cup well-shaken buttermilk
• 1/2 teaspoon salt
• 1 1/2 cups confectioners sugar
• 1/2 teaspoon vanilla
• 1 tablespoon light corn syrup
• 1 1/4 cups all-purpose flour
• 1 to 2 tablespoons water
• 1/4 cup unsweetened Dutch-process cocoa powder
• 2 teaspoons fresh lemon juice
• 1/2 cup granulated sugar
• 1/2 teaspoon baking soda
• 1/4 teaspoon vanilla
• 1 large egg
• 1/3 cup (5 1/3 tablespoons) unsalted butter, softened