The Slog is the only place in the Commonwealth that grows them commercially and their business revolves around it. The name of their settlement comes from a trader saying the berries are worth the work it takes to get to retrieve them. They're rare, they're delicious, and considering all of the recipes they're involved in they're clearly useful. I'm shocked they're not treated like the delicacy they so easily could be.
Where are the Tarberry wines and jams and taffy and rolled fruit jerky that comes in measurements of feet? Why isn't Wellingham periodically asking us to run to the Slog for a shipment so he isn't caught possibly commiserating with ghouls? Where are the stalls and restaurants with dishes themed around it?
Point is Tarberries need more love, and while I do think they deserve their own radiant quests, a few nice Tarberry recipes would be more than enough. I just think that, if I go to a restaurant called Tarberry's craving a tarberry, I should have more options than raw or Mirelurk Jerky.