The flavor of this salmon chowder is greatly enhanced by adding either fresh dill or dried tarragon: each herb lends its own distinctively different and appealing character to the soup. Even if you don't keep instant mashed potatoes in your pantry, it's worth picking some up for this soup. They give the soup a thick, chowder texture without any heavy cream or butter. Leftover mashed potatoes work too, but give a slightly less-velvety texture. Recipe by Nancy Baggett for EatingWell.