Wash the whole chicken under cold water, pat it dry, then cut it open along the breastbone and remove any excess skin.
Turn the chicken over, cover it with plastic wrap and use a kitchen mallet to gently pound it flat so it cooks evenly.
For the marinade, add freshly ground black pepper, paprika, salt, sour cream, one clove of crushed garlic and red pepper to a deep bowl.
Stir everything with a spoon until you have a smooth, even mixture that coats the spoon.
Rub the chicken generously on all sides with the marinade, place it in a bowl and leave it to marinate for 1.5–2 hours.
When the time is almost up, put the pressure pan on the stove and spread the pieces of butter over the bottom so they melt and cover the surface.
Place the chicken in the hot pan breast side down, arranging it as flat and compact as possible.
Cover the chicken with a thick plate or another heat resistant dish that fits inside the pan.
Put a heavy weight on top of the plate, such as a pot filled with water, and fry over medium heat for 20–25 minutes.
While the chicken cooks, prepare the sauce: finely chop the green onion and parsley into a bowl, pour in the water and lemon juice, then add the remaining chopped garlic.
Stir with a wooden spoon until the herbs, garlic and liquid are well combined and the sauce looks uniform.
When the skin side is nicely browned, carefully remove the weight and plate, turn the chicken over and cook for another 20 minutes until the other side is also golden.
Transfer the cooked chicken to a large serving platter, keeping it in one piece if possible.
Spoon the fresh herb and lemon sauce over the hot chicken tabaka and serve it as a main dish for lunch or holidays, with potatoes, another side dish, cooked vegetables or a simple salad.