In medium saucepan bring to boil, 1 gallon water. Add potatoes and par boil potatoes until tender. Drain water. Add butter and garlic to hot potatoes. Stir to make sure potatoes are completely coated with butter and garlic mixture. Lay out on sheet pan and roast in oven at 350 degrees until golden brown. Remove from oven and cool. In large mixing bowl, combine Romaine, celery, onions, and cooled potatoes. Toss gently. Add Casaer dressing and toss until all items are equally coated. Place in serving bowl and sprinkle with parmesan cheese. Serve or regrigerate until ready to serve.