Thoroughly wash the meat, place into the soup pot and completely cover with cold water.
Start warming the pot up over medium heat. As soon as froth starts to form, remove it with a spoon. Keep removing the froth until no more is produced. This typically takes 15-25 minutes.
Cover the pot, lower the heat and simmer for 3-4 hours.
In the meantime, prepare the 'podzharka'. Heat 2 tbsp cooking oil to medium-high and sauté the onions for 3-4 minutes until translucent. Add the carrots and continue to fry for another 2-3 minutes. Add 1 tbsp tomato paste and continue to fry for one more minute, stirring constantly. Season with 1/3 tsp of salt and set aside.
Peel the brined cucumbers and cut them into half circles, approximately 5mm thick.
Drain the olives and capers (see notes).
When the broth is ready, remove the meats and let cool. Discard bones, fats and tissues and cut into bite sized pieces.
Check the broth. If it is not clear enough, strain through a fine mesh to get rid of all impurities.
If using potatoes, cut them into large chunks, add to the pot with the broth and cook until they are done.
Return the meat to the pot and add cucumbers, olives, capers and onions & carrots 'podzharka'. Stir to combined and warm through until the soup just starts to boil.
Turn the heat off and allow solyanka to sit at room temperature for a few hours before serving.
Serve with a slice of lemon, chopped herbs, sour cream and fresh bread.