In a bowl add your mashed potatoes, eggs, flour, 1/2 tsp salt, and dill and mix everything together. It is easy to do by hand, or you can use a stand mixer with the dough hook attachment. Make sure the potatoes are chilled or room temperature before beginning.
In a pan add a bit of oil and sauté the onion, bell pepper, and leek until soft. Then add the pork and cook until browned. Remove from the heat.
Using your hands and a well floured surface, take some of the potato dough and stretch it into a disk. Add some pork filling to the center and then use your fingers to seal the dough around it. Place on a floured surface while you work on the rest of the potato zrazy
In a pan on medium-high heat add enough oil to coat the bottom and then some. Carefully slide in the potato zrazy using a spatula. Fry for about a minute then flip to the other side.
Serve potato zrazy with smetana or sour cream.