Mix all the dry ingredients and knead in the butter.
Then add the eggs and vinegar.
Knead into a dough. Make balls of the dough and place them on buttered paper in a baking dish. Sprinkle with some sesame seeds (if desired).
Bake the balls for 20 min in a preheated oven at 180 °C.

Tip: sodium bicarbonate
Sodium bicarbonate is a mineral salt also known as baking soda or baking soda. It used to be commonly used in home pharmacies to restore acid-base balance. But sodium bicarbonate is also used as a raising agent in pastries. Note that it only works if you add something acidic to the recipe, in this case cider vinegar.

It is extremely delicious, you will be surprised! These crispy buns are composed mainly of nuts and egg, so you can combine them with anything. Delicious with just a little butter, but they are also super tasty with a slice of ham.