This is too cruel! Spock could at least be smoked chicken! He has seasonings, and they're actually more intense than human seasonings! It's why he must struggle so hard to control them, with white bread and mayo, (maybe some capers for a light touch of alien zing).
But in the struggle to stay connected to his Vulcan roots, he suppresses his want of more flavorful ingredients. Still, his human side grants him the will to allow the spritely and mildly spicy punch of chipotle mayo.