This is such a great dish! You can get creative by adding more options like water chestnuts, nuts, green onion, shrimp... the list is endless. This recipe was a accidental mixture that has been a hit over and over.
Start with a salad of smoked salmon and watercress. Try to buy the commercial bagged watercress that already has been cleaned to speed things along, or you may substitute other mixed salad greens. (I like to make sure there are some bitter ones, such as radicchio and arugula, along with milder greens, such as butter lettuce or baby spinach.) Also, because this is such a simple salad, all the ingredients should be top-quality. So spring for the best smoked salmon you can find.