My favorite was the mashed potato sub, which was room temperature mashed potatoes mixed with bits of chopped vegan ham and carrots, served in a hot dog roll, topped with ketchup and mustard. It was really good, though it cracked me up that this was what they might think we eat in the US.
I've also noticed that many of the vegan Western food places serve dishes that they call "risotto" which are basically just cooked rice with sauce on top. I understand how they settled on risotto, but it can be a bit of disappointment if you're expecting actual risotto.
Overall, I have a lot of fun trying the Taiwanese interpretations of American food. The food quality there is just really high in general. Even if it's weird, it's weird with good ingredients and flavors, so you never end up with something inedible, just surprising in a fun way.