I have been making taco salads for quite some time now. After my first attempts resulted in soggy, hard to break up tostadas I tried this method. I save all the broken store bought tortilla chips at the bottom of the bag for this. If I do not have enough I break up some more into bite size. Anything you put directly on the crisp tortilla will soon make it soft. So I put the meat on the plate first, followed by taco sauce or salsa, sour cream, shredded lettuce, diced de-seeded tomato, diced onion, shredded cheese and finally the broken tortilla chips. You can put anything you prefer in your salad, but putting the chips on last keeps them crisp and much easier to eat, and I enjoy that crunch.