Beware of hardened Boca burgers
I enjoy eating at Red Robin; they have a delicious menu, and you can substitute Gardenburger or Boca burger patties if you're of a vegetarian persuasion.
I've had a consistently good experience with RR since we moved to the USA, but over the last couple of months the boca burgers have been a bit tough at the Columbia location.
The last one I ordered did this to my fork. Ow!