In a sturdy pot add vinegar and berries, allow to come to a boil, simmer and smash berries with a potato masher or a spoon.
Continue to simmer until reduced by about half, add molasses, stir and simmer five more minutes.
Remove from heat and allow to cool for about 15-20 minutes.
Strain the glaze into a jar with a mesh screen to remove all the berries.
Prepare Boston Butt by sprinkling with salt and pepper all over.
Preheat oven to 350 degrees
Heat skillet over medium-high heat with just a touch of oil, when hot sear meat, turning until all sides are seared.
Pour about 1/4 cup of the Balsamic Blackberry Glaze over the top of the meat, turn and add another 1/4 cup. Add sprig of mint to pan with meat.
Put the skillet with the meat in the oven and cook for 45 minutes per pound or until meat thermometer reaches a minimum internal temperature of 145 degrees or up to 170 degrees for well done meat.
Allow meat to rest for 5 minutes after removing from stove before slicing.
Garnish with mint prior to serving.