Avocado And Watercress Salad

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Ingredients

1/4 cup rice vinegar (not seasoned)
1 tablespoon grated sweet onion such as vidalia or walla walla (use large holes of a box grater)
1/4 cup finely grated peeled gala apple (use small holes of box grater)
4 teaspoons soy sauce
1 teaspoon sugar
3 tablespoons vegetable oil
6 cups watercress (thin stems and leaves only; from 1 large bunch)
1 firm-ripe avocado