Easy BBQ Pulled Pork

Name: Easy BBQ Pulled Pork
Prep time: 15 min
Cook time: 360 min
Total time: 375 min
Ingredients: 3 lbs pork shoulder roast; 1 large onion, quartered; 2 tbsp minced garlic; 1 can soda (cola); 1/2 cup BBQ sauce, if desired; 8 hamburger rolls