Prepare the rice. In a saucepan over the stove bring 2 cups of water to boil. Add the rice, reduce the heat, cover and simmer for about 20 minutes, until the water is absorbed.
Prepare the meat. In a pan on medium heat sauté the diced onions in 1 tbsp oil, until they are soft and golden. Add the meat, and sear it for a few minutes while stirring constantly. Add the minced garlic, salt, pepper, paprika, parsley. Lower the heat, cover and simmer it for about 8-10 minutes.
Preheat oven to 180 °C / 350 F.
Prepare the Brussels sprouts. Wash in cold water, cut the stem, peel off and discard any outer leaves that are old, yellow or dry. Cut the Brussels sprouts in half. Using a steamer basket, steam the Brussels sprouts for about 5 minutes, until they are fork tender. Butter a large glass or ceramic oven proof dish. Spread first the rice in the bottom of the dish, then the meat, and the Brussels sprouts last.
Spread the sour cream on top, and place the dish in a preheated oven for about 30 minutes. Serve it hot with some pickles on the side. Bon appétit - Jó étvágyat!