Preheat your oven to 210°C and line a baking sheet with parchment paper.
Open the cans, lay out the discs of dough and let it rest for ca. 15 minutes, so it can come to room temperature a bit.
Cut each disc into 4 pieces.
Bring the water with the baking soda to a boil. Then carefully drop the dough pieces into the water, just several pieces at a time.
Leave them in the water for about 15-20 seconds, then take them out with a slotted spoon.
Lay them on the prepared baking sheet and brush each piece with the beaten egg.
Sprinkle with the sea salt.
Bake in the middle of the oven for ca. 15 minutes or until golden brown.
Serve plain or with a warm cheese dip.