On the plastic wrap, draw a circle with a diameter equal to the bottom of the mold + the height of the two sides. Turn the film over to the other side and lightly lubricate it with vegetable oil (I use a cotton pad). Melt the chocolate in a water bath or in a microwave oven – as it is convenient for anyone. Cover the drawn circle with hot chocolate. This can be done with a pastry bag or simply with a spoon. You can do everything symmetrically and neatly, but I wanted to give a little carelessness, emphasize "home cooking", so I just smeared the chocolate with a spoon. Allow the chocolate to cool slightly and thicken slightly.