Preheat the oven to 355°F / 180°C and line large baking sheets with parchment paper.
Place the honey, sugar, and butter in a large saucepan over low heat. Let them melt together, stirring now and again, for about 5 minutes.
Remove the pan from the heat and let the mixture cool slightly. Add the eggs a little at a time, whisking constantly so they blend in without cooking.
Stir in the vanilla and baking soda. Add the sifted flour and fold it in with a spatula until you have a soft, slightly sticky dough.
Divide the dough into 8 equal pieces.
Roll one piece of dough on a lightly floured surface into a 9-inch / 23 cm circle.
Use the base of a cake pan or a plate as a guide and trim the edges with a small knife. Keep the scraps for the crumb coating.
Repeat with a second dough ball, then transfer both dough circles to lined baking sheets.
Bake for 4 to 5 minutes, or until golden.
Transfer the baked layers to a wire rack and let them cool completely.
Repeat with the remaining dough pieces. Roll the next layer while the previous one is baking to save time.
Spread the reserved scraps on a baking sheet and bake for 6 to 8 minutes, or until dry and golden.
Let the scraps cool completely, then crush them in a food processor to make fine crumbs.