Preheat oven to 275 degrees Fahrenheit. In a large bowl, toss beef cubes with olive oil, brown sugar and spices until well coated.

Heat a large skillet over medium-high heat. Working in batches, sear beef cubes for two to three minutes per side, until browned, then transfer to a baking dish.

Pour beef broth over the beef, cover tightly with foil and cook for two hours, until meat is fork-tender.

Pour barbecue sauce over the beef, cover tightly with foil and return to the oven to cook for another 30 to 60 minutes.

Raise oven to 450 degrees Fahrenheit, uncover and continue to cook for 10 minutes until sauce is thickened and glossy.