The egg salad sandwich is perhaps the most underrated sandwich. It actually is a fine sandwich. I like to add black or green olives to give it an extra dimension of flavor. I believe an egg salad sandwich can taste as good as a gourmet sandwich if made well and with some creative twists.
Another great thing about this sandwich is that it is cheap. People talk about being on a low budget and being stuck with ramen noodles but the egg salad sandwich is a good break for the ramen eaters who get burned out on the noodles. Lastly, it is a no brainer to make. Just boil eggs, let cool a little and add mayonaise. It's cheap, delicious and a nice base for creativity for those who want to add other things to it.