In a bowl, mash the margarine with the sugar using a fork. Add the salt, vanilla sugar and flour, knead the dough and gather it into a ball.

Divide the dough into two parts and mix cocoa into one of them. Chill both balls of dough for 30 minutes so they can rest.

Roll out each ball into a sheet and cut out hearts with a heart-shaped cutter: first the light ones, then the chocolate ones. Cut the chocolate hearts in half - these will be Tuzik's ears - and pinch off small bits of dough for the nose and eyes.

On a floured baking sheet, lay out the light hearts first. Attach the chocolate half-hearts to them as ears. Finally, roll small balls and attach them as the nose and eyes.

Bake in an oven preheated to 200 °C for 15 minutes. Let the cookies cool, then enjoy. Enjoy your meal!