Marinating beef strips for stir-fry is a fantastic way to infuse flavour and tenderise the meat. Begin by selecting a good cut of beef, such as sirloin or flank, and slice it into thin strips, roughly 1/4 inch thick.

In a bowl, combine your marinade ingredients. A simple yet effective marinade might include soy sauce for saltiness, a splash of rice vinegar or lemon juice for acidity, and a teaspoon of sesame oil for a rich, nutty flavour. You can also add minced garlic and ginger for an aromatic kick. Additionally, consider a touch of honey or brown sugar to balance the saltiness and create a lovely glaze.

Once your marinade is mixed, add the beef strips, ensuring they are well coated. Cover the bowl with cling film and allow it to marinate in the fridge for at least 30 minutes; however, for best results, aim for a couple of hours or even overnight. This will not only enhance the flavour but also help to tenderise the meat, resulting in a delectable stir-fry. When ready to cook, simply drain any excess marinade and follow your preferred stir-fry method. Enjoy your meal with some crisp vegetables and a bowl of steamed rice!