Heat chocolate chunks and coconut oil over a water bath (a bowl surrounded by hot water) and gradually stir the chocolate-coconut mixture until melted. Allow to cool slightly.
200 grams milk chocolate, 200 grams refined coconut oil
In a medium bowl, combine eggs, powdered sugar, vanilla and a pinch of salt and beat with an electric mixer for 5 minutes until creamy. On the lowest setting, add in the cocoa powder and milk and beat until combined. Finally, add in the chocolate-coconut mixture.
2 eggs, 150 grams powdered sugar, 1 teaspoon pure vanilla extract, salt, 100 grams cocoa powder, 4 tablespoon milk
Prepare a rectangular bread pan with parchment paper, leaving enough paper around the edge to make it easier to pull the Kalter Hund out when it's ready., Spread the chocolate mixture onto the bottom and sides, then layer butter cookies and chocolate mixture, making sure the cookies are close to each other for each cookie layer, potentially cutting them into smaller pieces to fit the baking pan. End with the chocolate mixture, then transfer to the fridge to cool overnight, for about 12 hours or longer.
220 grams German Leibniz butter cookies
Carefully remove the cake from the form. Feel free to decorate with more chocolate (for example a white chocolate drizzle). Guten Appetit!