Chinese-Style Pork Chops with Onion & Ketchup Sauce

I adapted this from Wei Chuan's cookbook, Chinese Rice and Noodles. I wasn't sure where this recipe came from but, by some accounts, it is probably Cantonese in origin. The sauce is nicely sweet and sour and the sautéed onions add extra flavor and texture. Easy to make and excellent served with steamed white rice on the side. A great alternative to your standard fried pork chops. It's not part of the original recipe, but I like to add a pinch of red pepper flakes to the sauce to give it just a little bit of a kick.