Pork tenderloin stir-fry is a quick and easy meal that is perfect for busy weeknights. To make this recipe, you will need a pork tenderloin, vegetables of your choice (such as bell peppers, onions, and broccoli), garlic, soy sauce, and cornstarch. First, slice the pork tenderloin into thin strips. In a large skillet or wok, heat some oil over high heat. Add the pork tenderloin and cook until it is browned on all sides. Remove the pork tenderloin from the skillet and set it aside. Add the vegetables and garlic to the skillet and cook until they are tender. In a separate bowl, whisk together the soy sauce and cornstarch. Add the pork tenderloin back to the skillet and pour the soy sauce mixture over it. Cook for a few minutes, or until the sauce has thickened and the pork tenderloin is cooked through.