1) Combine all ingredients (except the pork tenderloin and cornstarch)
in a small saucepan over medium heat.
2) Cook until the blueberries begin to release their juice.
3) In a large slow cooker, pour the blueberry sauce over the pork
tenderloin.
4) Cook on low for 6-8 hours or on high for 4-6 hours.
5) Remove the rosemary and shred or slice before serving.
Notes
1) If desired, when the tenderloin is cooked, remove the sauce from the
slow cooker.
Whisk in the cornstarch and heat on the stove until the sauce thickens
and becomes a glaze.