The hrechaniks with meat are soft, tender cutlets made with buckwheat and mince meat. So it can be served as a main course or a side dish. You can use any mince meat to your taste. The dish is usually served with either tomato or garlic sauce, and salad.
The rassolnik is a historically Russian main course that is why it is very common at Ukrainian table. It is made with pickled cucumbers and cucumber pickle.