Cut around pan to loosen cake. Turn out onto work surface; peel off paper. Using long serrated knife, cut cake horizontally in half. Place 1 half, cut side up, on platter. Drizzle half of syrup (about 3 1/2 tablespoons) over. Using electric mixer, beat cold chocolate filling until thick and lighter in color, less than 1 minute. Spread all of filling evenly over cake layer, aligning with sides of cake (filling will be about 1 inch thick). Drizzle remaining syrup over cut side of second cake layer. Place layer, syrup side down, atop filling; press to adhere. Rewarm topping over low heat just until pourable. Pour topping onto top center of cake. Using small spatula, spread topping to edges, being careful to keep it from spilling over. Chill cake up to 1 day, covering loosely with foil or with cake dome after 2 hours.
Step 6 :
Cut cake into 16 squares and serve.
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