In small bowl combine vinegar, juice, soy sauce, salt and pepper; gradually whisk in oil. Stir in parsley and shallot finely chopped. In bowl toss spinach with onion thinly sliced. Peeled and cut into segments an orange and cut tomato into thin wedges.
Arrange orange and tomato over spinach; sprinkle with walnuts. Stir dressing; drizzle over salad and gently toss.
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