In a large pot, heat the vegetable oil over medium heat. Add the pork chunks and brown them on all sides. Remove the pork from the pot and set aside.
In the same pot, add the finely chopped onion and sauté until golden brown.
Add the minced garlic and cook for another 1-2 minutes until fragrant.
Sprinkle the flour over the onions and garlic, and stir to combine.
Gradually add the beef or pork broth, stirring constantly to prevent lumps from forming.
Add the milk and continue to stir until the mixture thickens.
Return the browned pork chunks to the pot.
Add the bay leaf and season with salt and pepper to taste.
Reduce the heat to low and let the machanka simmer for about 1 hour, or until the pork is tender and the flavors have melded together.
Stir in the sour cream and cook for another 10 minutes, until heated through.
In a mixing bowl, combine the flour, milk, egg, and salt. Mix until smooth.
Heat a small amount of vegetable oil in a skillet over medium heat.
Pour a ladleful of batter into the skillet and cook until the pancake is golden brown on both sides. Repeat with the remaining batter.
Enjoy your meal!