https://www.reddit.com/r/unpopularopinion/comments/qavx0b/lettuce_doesnt_belong_on_a_hamburger/?utm_source=share&utm_medium=web2x&context=3 Iceburg lettuce doesn't wilt easily from heat and protects the bottom bun from becoming soggy from the juices of the meat. It doesn't do its job if you have it on top.