*TOOLS*
Bowl Mixer, Pastry brush, Cookie sheet, Spatula, Wire cooling rack, small Spoon
With an adult's help, preheat oven to 160ºC .
Beat half pound butter until creamy., Add sugar, a little at a time, until all the sugar has been used.
Add the egg whites and flour to the butter and sugar. Beat until the dough is well blended.
Dip a pastry brush into the tablespoon of butter and lightly brush a very thin layer onto the cookie sheet.
With clean hands, roll the dough into golf ball sized balls. Flatten the balls slightly, and using your thumb, press a dime size dent into the middle of each one. Place cookies, dent size up, about 3 cm apart on cookie sheet. Bake aobut dozen minutes or until Allow the cookies to cool on the cookie sheet for a few minutes before moving them to a wire rack with a spatula. When the cookies are completely cooled, use a small spoon to fillthe dent in each one with jam. Makes about 3.5 dozen blackheads.