My next attempt will involve adding swiss cheese as part of the stuffing. 
Kotleta Zauralskaya (Cutlets with Mushrooms)
115g mince beef
1.5 tbsp chopped parsley
1 tbsp beaten egg
1 tsp milk
1/4 tsp crushed garlic
1/8 tsp salt
Ground black pepper
- Mix all of the above.
Stuffing:
10g minced carrot
10g minced onion
30g minced cremini mushrooms
Pinch of salt
- Sweat the carrot and onion in butter.
- Add the mushrooms with a pinch of salt.
- Cook until dry-ish.
Plain flour
Remainder of beaten egg
40g potatoes, finely diced
- Wrap the stuffing within the meat mixture.
- Dredge in flour then coat with beaten egg.
- Roll in diced potatoes before frying in hot oil.
- Serve with Sour Cream-Dill Sauce (recipe below), onion fries, cucumber, tomato and greens.
(Recipe from here)
Sour Cream-Dill Sauce (mix all)
1/8 cup sour cream
1/2 tbsp chopped dill
3/4 tsp Dijon-style mustard
Salt and freshly ground black pepper
(Sauce recipe from here)
