Prepare the filling. Pour oil into a frying pan, heat it up and put the garlic cloves. Fry them for a minute so that the garlic gives its flavor to the oil, and take it out. In the fragrant oil, put the onion, cut at random. We brown it and add chopped cabbage to it. Fry the cabbage until tender, not very much. It will take about 15 minutes. At the end, add salt and pepper to taste with freshly ground black pepper if desired. Add sour cream, stir, reduce the heat to a minimum, cover with a lid and simmer the cabbage for 3-5 minutes. At the end, add chopped hard-boiled eggs to the filling. The filling is ready.