It's the most non-descript item on any Mexican food places menu.
Bean and cheese burrito.
Nothing fancy. Nothing earth shattering. Three basic elements. Tortilla, refried beans and cheese. But when done right, it is a masterpiece. The most purest form of simple perfection and for me, the telling tale of whether or not I'm going to patronize a taco shop.
Many people argue over the carne asada, the mariscos, the fish or shrimp tacos/burritos. All of those items are nice and all, but when a place takes the time, puts forth the effort and shows the true love of the basic ingredients it speaks volumes to me. You see, it's more than just a bean and some cheese. It's an indication of caring.
In the theme of simplicity, I leave this at that.