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When ready to cook, start the Traeger on Smoke with the lid open until the fire is established (4 to 5 minutes).
Arrange the onions on the grill grate. Smoke for 30 minutes.
Take onions off the grill and wrap each individually in aluminum foil. Return to the grill.
Increase the temperature to 350 degrees F. Roast the onions until they are tender, about 1 hour.
When onions are cooled, remove and discard the foil. Coarsely chop the onions, discarding the ends.
Meanwhile, in a large mixing bowl combine vinegar, salt, and pepper. Slowly whisk in the oil.
Add the bacon crumbles, onion, tomato, cucumber, and lettuce. Gently toss the ingredients until the salad is coated with the dressing.
Transfer to a salad bowl and top with croutons and Parmesan. Enjoy!