Braised beef with onion

Since my son was able to eat complementary food, my top priority every day, apart from taking care of my son, is to think of ways to make food for my son in a different way. This is the first time my baby has tried everything. Although he has no special preferences, some flavors are easy to accept, and some are unwilling to eat at all. Of course, when I made various foods for my son, I slowly summarized what flavors my son preferred and what flavors were easier to accept. There are some things my son just doesn't like, such as liver. I tried a lot of methods, such as steaming, cold salad, bibimbap, and steamed liver mashed egg custard, but it just couldn't work. Later, my son turned one year old and could accept a little more condiments, so I made him liver tips, but he didn't like it very much. I couldn't stop eating it even if I didn't like it. I had to think of a solution. Later, when I was making this onion braised pork, there was just no more cooked beef, so I replaced it with mutton liver for him, which was also chopped up. At lunch that day, I was still very nervous when I fed my son the first spoonful. Unexpectedly, my son didn't refuse. At lunch that day, my son ate half a bowl. Haha, for the sake of my mother's care, I finally discovered a way that my son could happily accept.