The second most important part is the meat. Not only the quality of the deli slices you've procured, but the placement in the sandwich. Far too often I've ordered a deli sandwich and the slices of meat are all stuck together one on top of the other. Ok, sure it may be the same meat, but I swear it tastes better when the deli slices are folded over themselves (almost like loosely rolled bundles) creating pockets of air between meat slices. Trust me, it makes a world of difference.
Next order of business: sauces/condiments. For yesterday's sandwich I used mayonnaise on one slice of bread and a homemade feta/onion/mint sauce on the other slice of bread (ok, maybe a little bit off-putting for some, but I'm trying to use up my leftovers here).
Finally, you may begin assembly. I start by partially toasting the bread, coating with the mayo/yogurt sauce, then piling. Roast beef, bacon, and gruyere cheese go on one side. Lettuce on the other. If i had had more ingredients in my pantry i could've gone to town: avocado, tomatoes, red onions, so on and so-forth, but i had to suffice with a meat-hearty meal. I put the portion with the cheese in the toaster oven, to melt the cheese atop the bacon and beef.
