In which I consider new uses for a jar of blackberry syrup

While rummaging in the pantry last night, I discovered an unopened jar of my mom's blackberry syrup. She distills it every summer, and my sister likes to have it on pancakes instead of maple syrup. But I'm wondering if it wouldn't make a fine marinade for a big piece of meat. I might also be able to concoct some way to get it into a cocktail--cut with something and added to vodka, maybe? More research is necessary...