Authentic Polish Pierogi with Potatoes and Cheese (Pierogi Ruskie)

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1. 1Step 1: Place potatoes in a pot, cover with water and cook until fork tender.
2. 2Step 2: In the meantime heat up the oil or ghee in a frying pan, add onions, and cook until golden brown.
3. 3Step 3: Once potatoes are cooked, using a potato ricer or potato masher, mash potatoes so they don't have lumps.
4. 4Step 4: Add farmer cheese and mix together.
5. 5Step 5: Add onions, other cheeses, spices, salt, and pepper and mix well.
6. 6Step 6: Pour the flour on a counter or other surface that will allow you to make the dough.
7. 7Step 7: Add a pinch of salt.
8. 8Step 8: Make a little hole in the middle and start adding milk and butter.
9. 9Step 9: Add a little water at a time and work the dough until you can form a ball about 10-15 minutes.
10. 10Step 10: Once done, cover it with the big bowl and let it rest for about 20-30 minutes.
11. 11Step 11: Roll the dough until thin (like pasta) and using either a cookie cutter or a large wine glass cut the circles.
12. 12Step 12: Place 1 teaspoon of the filling in the middle of the circle.
13. 13Step 13: Wet one half of the circle and then seal it together.
14. 14Step 14: Boil a large pot of water and season with salt.
15. 15Step 15: Once the water is boiling put about 8 pierogi at a time.
16. 16Step 16: Once they come to the surface let them cook for 1 minute and using a spider or slotted spoon take them out on a plate.
17. 17Step 17: If you want to fry them as I did here, use 1 tablespoon of oil or ghee and fry pierogi on each side until golden brown.
18. 18Step 18: Using separate pans add oil and onions and fry the onions until golden brown and bacon until crispy (you don't need fat for bacon as it is already fatty).
19. 19Step 19: Add onions and bacon on top of the pierogi and serve with sour cream.