Before starting to make the cake, turn on the oven (180-200 degrees C) and prepare the pan.
I used a 24x34 cm glass dish (bought from Ikea, at a very reasonable price). You can use any other deep baking pan of a similar size.
You can line it with baking paper or do what I did. Grease with butter and sprinkle over with breadcrumbs. This way, your cake will have straighter edges (I noticed that the paper distorts the shape of the cake, as it doesn't stick perfectly to the walls of the pan).
If you don't have breadcrumbs, you can grease with butter / oil and line with parchement. This way, it will stick better.