Start by washing your romaine lettuce. Pat each leaf dry with a paper towel. Trim off the thick center of each lettuce leaf.
Slice lettuce into one-inch thick pieces.
Wash cucumbers, tomatoes, and red onion. Pat dry with a paper towel; cut and slice vegetables.
Place romaine lettuce into a large bowl. Place all the vegetables on top of the romaine lettuce.
Sprinkle the parmesan cheese and add the dressing.
Whisk, toss and serve right away.
