This cake dough is made on a steam bath. Preheat water using a bowl on top of the boiling water, make sure the bowl does't melt. Place butter, honey and sugar, and let it stand there until it's all melted.
In a separate bowl, beat eggs with baking soda until they have one consistency. Slowly add egg mixture to the batter, continue mixing the whole time while adding.
Cook for about 30-40 minutes, until the color changes. Take it off the steam bath, add vanilla extract and let it sit for 10 minutes. Add flour to the dough; it may still be sticky after adding the flour. Preheat the oven to 350 °F and line baking sheet with parchment paper.
Flour the surface generously. Because the dough is sticky, this will help you work easier with it. Optionally, weigh each piece of dough, to maintain the size. Roll out the dough into a round shape, large enough to be cut out later. Relocate the dough layer to the baking sheet by rolling it onto a roller, then unrolling it back out onto the baking sheet.
Bake each layer of cake for 5-7 minutes, until golden brown. During the process of baking, roll out another layer to speed up the process. When it's done, remove it from the oven and cut out each circle by placing a plate over the top. This is the key trick to making all sides perfect. You'll need the cut off pieces for decoration, later.
Do not immediately stack the layers on top of each other, as they will lose its even shape. Rather, make sure they first cool off on a flat surface. Repeat until you are done.