Choosing the right ingredients for a sandwich is essential, and even when you do everything right, your sandwich can still end up gross. I've made many questionable sandwich-topping choices throughout my life, and I'm at peace with that. I spent at least a calendar year ordering burgers with only pickles and onions on them; I can only imagine what my breath smelled like during that year. I also regularly got black olives on my sandwich when I went to Subway, and let's just say I wouldn't make t…