How do you make the kind of sauce that you eat at a western restaurant?

Black Pepper Steak Sauce:

Stir-fry the first chopped garlic, ginger, and diced onion with a small amount of oil, pay attention to the fire not too much, and change to low heat after the oil is spicy. Then add tomato sauce (it seems that there is a special black pepper sauce in Western food, but ordinary people don't usually prepare it, so I use tomato sauce with a lot of black pepper instead!). But note that the ketchup can't be added too much, and you can't let it rob the black pepper and the meat flavor) The purpose of adding ketchup is explained, good!

Now don't forget that it's still fried in the pot, don't get distracted! Let's go on, stir the contents of the pot and add water, a little more water, because we have to add cornstarch to thicken it!

While collecting the soup, add some cooking wine, salt and monosodium glutamate, and finally add black pepper, add more black pepper (you can taste the soup at this time) until you feel the rich black pepper flavor!

Preparation of garlic mushroom sauce: Heat two tablespoons of olive oil, add fresh mushrooms, bell peppers, diced onions, and a tablespoon of minced garlic and stir-fry until fragrant; Add half a glass of red wine, four tablespoons of steak sauce and cook until the juice is halfway through.