 3 scientifically proven ways to make any sandwich taste better. No one likes a soggy sandwich. Spreading a layer of hydrophobic fat like butter or mayo on both pieces of bread will prevent them from absorbing other liquids. Whether it's toasted, griddled, or paninid, heat actually changes the chemical compounds of bread, enhancing the flavor. There's a reason burgers are built like this. Because of how much power smell has overtaste, strong spelling ingredients should go as far away from the nasal receptors as possible, so they don't overpower everything else. Also, please start seasoning your veggie toppings, you can think of this later.