In a complex dish, one weak ingredient can disappear into the sauce. A sandwich is not that generous. With only a handful of components, each one is tasted almost on its own — so quality is not a luxury, it is the whole game.

Nowhere to hide

When you bite a sandwich you taste the bread, the meat, the cheese and the vegetables as distinct things. A tired tomato or a rubbery cheese is obvious immediately. Great raw materials simply taste better with less effort.

Quality beats quantity

Two slices of excellent pastrami beat four slices of a cheap substitute. Piling on more of a mediocre filling adds weight, not pleasure.

Spend on what you taste most: bread first, then the hero filling, then the supporting cast.

Consistency

Quality ingredients also behave predictably, which is how a sandwich tastes the same on your tenth order as it did on your first.