One of the best tostada experiences I have had--at a potluck someone brought a vat of potato salad
with chicken included. Probably meat fron a rotisserie bird from the supermarket, but the potato salad was homemade and included a chiffonade of iceberg lettuce. Served it on tortilla rounds (the pre-fried packaged kind) with a bottle of Tampico hot sauce on the side. I had five tostadas and I wouldn't have changed a thing.