01 -
In a bowl, mix the flour and salt. Create a well in the center, add the egg, and gradually mix in the warm water until a dough forms. Knead for about 5 minutes until smooth. Cover and let rest for 15 minutes.
02 -
In a skillet, melt the butter over medium heat. Add the chopped onion and cook until caramelized, about 10 minutes. Stir in the cooked buckwheat, season with salt and pepper, and remove from heat.
03 -
Roll out the dough on a floured surface to about 1/8 inch thick. Cut into circles using a glass or cookie cutter.
04 -
Place a teaspoon of filling in the center of each circle. Fold the dough over and pinch the edges to seal.
05 -
Bring a pot of salted water to a boil. Cook the pierogi in batches until they float to the surface, about 3-4 minutes. Remove with a slotted spoon.
06 -
Optionally, sauté the boiled pierogi in a skillet with a little butter until golden brown.