The preparation method and steps of steak are as follows:

1. Tap the beef tenderloin with the back of a knife, evenly sprinkle with salt, sugar and black pepper, and knead into the meat for 40 minutes.

2. Take sugar, oyster sauce, tomato sauce, butter, onion, black pepper, salt and garlic paste, stir-fry onion and garlic paste in melted butter, then add salt, sugar, oyster sauce, tomato sauce, black pepper and water and cook for 5 minutes.

3. Sprinkle a little cornstarch on the marinated steak, put butter in the hot pot, and add the steak to fry. When cooked, take it out and pour it with sauce.