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1
Preheat oven to 350F (180C).
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2
Remove the dividers from two 11 x 4 x 1 1/2-inch metal ice cube trays; butter and flour the trays.
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3
Sift the flours, cocoa, baking powder, baking soda and slat.
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4
Toss the chocolate chips with 2 teaspoons of the sifted mixture.
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5
Cream the butter in the large bowl of an electric mixer on low speed for 5 minutes.
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6
Add the sugar and continue beating for 3 to 4 minutes.
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7
Add the eggs, one at a time, beating well after each addition.
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8
Blend in the milk, vanilla extract and melted chocolate.
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9
Blend in the sifted mixture on low speed.
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10
Stir in the chocolate chips.
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11
Scrape the batter into the prepared pans, dividing it evenly between them.
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12
Bake for 25 minutes, or until a toothpick inserted in the center comes out clean.
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13
Cool each cake in the pan on a rack for 3 to 4 minutes, invert onto another rack and turn each right side up.
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14
Cool for 10 to 15 minutes.
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15
Cut each cake on the diagonal into about twelve 3/4 inch thick slices, using a sharp serrated knife.
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16
Arrange the slices on two jelly roll pans or cookie sheets.
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17
Bake the slices for 7 to 9 minutes, turn them over and continue baking for 7 to 9 minutes longer, or until firm.
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18
Remove the rusks to a cooling rack using a wide metal spatula.
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19
If you are finishing the cookies with granulated sugar, sprinkle some over each while they are warm.
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20
Cool completely.
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21
If you are using the chocolate glaze, dust off any crumbs adhering to the cookies with a soft pastry brush.
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22
Dip an end of a rusk in the glaze and hold it until it stops dripping, gently rocking the cookie from side to side.
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23
When the chocolate is on the point of setting, carefully place each rusk on a legth of parchment paper until the glaze firms up, about 20 minutes.
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24
To embellish the cookies further, you can dip the tip end of the glazed rusk in chocolate sprinkles; do this just before you place in on the parchment paper.
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25
Peel away the glazed cookies from the parchment paper.
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26
Store in an airtight container.