Tough cuts of meat, such as shoulder or chuck steak, can be tenderized using various methods. Here are several techniques you can try:

1. **Marinating:** Marinating the meat in a mixture of acidic ingredients, such as vinegar, citrus juice, or yogurt, can help break down tough muscle fibers and improve tenderness. Additionally, adding ingredients like soy sauce, Worcestershire sauce, or pineapple juice can further enhance flavor and tenderization.

2. **Pounding:** Use a meat mallet or the back of a heavy skillet to pound the meat evenly to break down the muscle fibers. This method helps to tenderize the meat and also helps it cook more evenly.

3. **Brining:** Soaking the meat in a brine solution of water, salt, and sometimes sugar or other flavorings can help tenderize tough cuts. The salt in the brine helps to break down muscle proteins, resulting in a more tender texture.

4. **Slow cooking:** Cooking tough cuts of meat low and slow, either in a slow cooker, braising pot, or oven, can help break down collagen and connective tissues, resulting in a tender and flavorful dish. This method allows the meat to slowly tenderize and become moist and succulent over time.

5. **Using a meat tenderizer:** Mechanical meat tenderizers, such as a handheld tenderizing tool or a tenderizing mallet with metal spikes, can be used to physically break down tough muscle fibers and connective tissues.

6. **Enzyme-based tenderizers:** Some fruits, such as kiwi, papaya, and pineapple, contain natural enzymes, such as bromelain and papain, that can help tenderize meat. Puree these fruits and use them as a marinade or apply them directly to the meat for a designated period before cooking.

7. **Cooking with moisture:** Cooking tough cuts of meat with added moisture, such as broth, wine, or tomato sauce, can help keep the meat moist and tender during the cooking process.

8. **Resting:** Allow the cooked meat to rest for a few minutes before slicing or serving. This allows the juices to redistribute throughout the meat, resulting in a more tender and flavorful dish.

By employing one or a combination of these techniques, you can effectively tenderize tough cuts of meat and enjoy delicious and tender dishes.