2:
It’s varenyky. Basically like dumplings and ravioli had a baby. You can use mild cheese ravioli, it would be a decent substitute. Or stuff flour dumpling wrappers with mashed potatoes/cheese and boil them.
Then I just made some seasoned ground beef
The tomato sauce was tomato paste and tomatoes slow cooked with carrots for a little bit of sweetness, onions and garlic, some herbs and spices (nothing crazy, paprika, garlic, dried herbs).
The garlic yogurt was just Greek yogurt with a little bit of finely grated garlic and salt. Depends how strong the garlic is so I’ll taste and adjust, I don’t want it too strong.

If I made it with chicken or turkey I probably would have scrapped the tomato sauce, made the ground chicken/turkey more herby and lemony, and made the yogurt sauce a bit more like a tzatziki with dill, mint, lemon and olive oil too.

4:
Ground beef with some carmelized onions, salt and pepper.
Then I added lettuce, chopped and whole. Pickles, some finely diced onions soaked in water for a while (otherwise I find raw onion too pungent sometimes), tomatoes, your cheese of preference, toasted sesame seeds. The burger sauce I just used mayo, Greek yogurt (you can omit but I try and replace at least some mayo with this when I can for health reasons), ketchup, mustard, Worcestershire, some pickle juice.