This is a delicious braised beef tenderloin recipe with a savory-sweet soy-vinegar sauce that makes an awesome family dinner. A tender and succulent one-pot dinner recipe that is an excellent lunch and dinner idea. Braising comes from the French word “braiser”. It is a combination of moist and dry heat cooking methods. The dry heat cooking method is searing at a high temperature. Then once it is seared and browned, it is put into a pot and covered with liquid to cook at a low temperature for several hours. The braising liquid can impart flavor and make the tenderloin very tender and delicious.