Start by chopping the onions. Heat a suitable size pan over medium heat and add the oil. Then, toss in half of the chopped onion and reduce the heat to medium-low. Allow the onion to cook until it turns golden.
While the onions cook, prepare the rice to al dente stage.
Mix the cooked onions, rice, minced meat, salt, and black pepper to create a homogenous filling. Set it aside.
For the sauce, heat another pan over medium heat, add oil, and cook the remaining half of the chopped onions until they become translucent. Add tomato paste and ketchup, letting it caramelize briefly for about 5 minutes. Then, add sour cream and ½ cup of chicken broth. Bring the sauce to a gentle simmer for about 5 minutes, remove from heat, and set aside.
Wash and clean the peppers, cutting off the tops and removing the seeds and membranes.
Stuff the peppers with the prepared filling of chopped onions, rice, and raw minced meat.
In a large pot, arrange the peppers so that they stand upright. If needed, place a second layer of peppers on their sides.
Pour the tomato sour cream sauce over the peppers and top up with the remaining chicken broth, ensuring the peppers are halfway submerged in the cooking liquid. Add more chicken broth or water if necessary.
Bring the pot to a boil, then reduce the heat to a simmer. Cover with a lid and let the peppers simmer for 30 to 40 minutes.
Serve with a generous ladle of sour cream-tomato cooking sauce, a dollop of sour cream and optionally garnish with dill. As with many stewed dishes, this dish tastes even better the next day, as the flavors meld together.
To reheat the dish, carefully arrange the desired number of stuffed peppers in a pot with a lid. Add the sour cream-tomato cooking sauce to the peppers. Gently warm the dish over low heat, allowing it to simmer for approximately 15 minutes to ensure thorough heating.