Sour cream - We have creme freche but no sour scream here in Spain. When we make nachos here it's not quite the same.
Sloppy Joes - When my wife asked if I wanted Sloppy Joes one day I shouted, "Yes." I didn't even know I was missing a Sloppy Joe until she said it.
Tacos - Obviously.
Food delivery. Yes, I know it's bad for the environment but I miss the convenience of it.
Guns. I miss being able to walk into a store and buy a gun and then carry it around with me wherever I go. On the plus side I do have bow and arrow that I carry with me here in Spain for protection. A bit more challenging than carrying a handgun but still people avoid me.