Grease a ceramic or glass baking dish (with a lid) with butter. (Do not use enameled dishes! I cook beef according to this recipe in a heat-resistant glass saucepan with a capacity of 2 liters. For the preparation of dishes, based on 1 kg of beef, a capacity of 2-2.5 liters is required). We put the meat and onion in a greased bowl, mix, close the lid and put it in a preheated 180 degree oven. You can forget about meat for two hours! But I still recommend an hour to look under the cover. And if some pieces of meat are not completely immersed in the released juice, help them – squeeze a little.