Hi Kirk,
It wasn't until I did something really stupid that I understood that espresso is a sweet drink in general. What I did was that once, for a not so clear of a reason I poured my espresso over a bowl of soup that I was having for dinner. That soup was a salty one, and the whole combination, well... Sucked... That is, it was an AWFUL combination!
Why was it so awful? Because it so clearly combined a salty liquid with a "sweet" one! Later on, I started observing that some coffees make a considerably sweeter espresso than others, where the coffee I know which possesses this quality has a distinguished chocolate flavour as well. I remember that when I first bought my machine I was still naive regarding its thermal management, which is a bit difficult, so I used to frequently brew shots at high temperatures, leading into burnt espressos, which for some reason caused the chocolate flavour in this coffee to jump out, and my parents kept wondering why would their latte sometimes taste like bitter chocolate (which was by the way an unpleasant property).
I photographed a typical shot of this sort, along with the bag of this coffee blend I am referring to, in case that matters to you

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EDIT: Although the espresso below is considerably sweet, it does have a dull/astringent flavour, maybe similar to hazelnut, which is why I don't usually prefer it for straight shots, however it's very, very good with properly steamed milk, and makes such a perfect latte base.

