In a blender or food processor, combine sugar, lemon juice, onion, mustard, and salt. Process until well blended. With machine still running, add oil in a slow, steady stream until mixture is thick and smooth. Add poppy seeds, and process just a few seconds more to mix.
In a large serving bowl, toss together the romaine lettuce, shredded Swiss cheese, cashews, dried cranberries, apple, and pear. Pour dressing over salad just before serving, and toss to coat.
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