Whip the eggs in a large mixing bowl with a hand mixer for one minute or until pale. Set aside.
In a heavy-bottomed medium saucepan, add the butter, honey, and sugar. Heat over medium heat until the butter has melted and the mixture starts simmering.
Lower the heat to low and add baking soda. Whisk to combine. The mixture will bubble and expand a lot but will then subside. Cook over low heat, stirring continuously to prevent the honey burning, until the mixture turns a light amber color.
Remove from the heat and slowly pour the honey mixture into the eggs, whisking vigorously. Then, sift in the flour with salt and mix until no dry ingredients are left. The dough should be sticky, don’t add more flour! Wrap the dough in plastic wrap and place it in the fridge for 1 hour.
Preheat the oven to 180C (355F). Prepare a baking sheet and 10 pieces of parchment paper (one for each cake layer).
Split the dough into 10 even parts (around 85g each). Take one piece and place it on parchment paper, cover it with a piece of plastic wrap, and roll the dough (it should be 1-2mm thick) so you can cut out a 7”/17cm disc and have some left over.
Cut out a 7” disc and spread the leftovers 1 inch away from it. We will use the leftovers to decorate the cake.
Bake each layer for around 4 minutes or until golden. Remove from the oven and let it cool down for a minute on the baking sheet. Then, transfer it onto a cooling rack. Place the leftovers onto a separate plate. Don’t stack baked cake layers on top of each other if they’re still warm.