This is one of the best Thai salads I have ever tasted and I just had to share it with my zaar family. Try it, you won't regret it. You can substitute the beef with the same amount of Pork fillets, chicken breasts or thigh fillets, or some firm tofu. When preparing this salad in advance, cook the beef, prepare the salad, and make the dressing, BUT STORE EACH IN SEPARATE CONTAINERS. Do NOT combine until you are ready to serve. This is an ideal portable lunch or picnic dish that can be transported in 3 small containers, and assembled on the spot.