According to package instructions, steam the green beans.
Cook the bacon in a skillet until it begins to crisp then add in the onion and cook for 2 to 3 minutes. Drain off the fat.
Add the brown sugar to the skillet, ketchup, worcestershire sauce, vinegar and mustard. Mix until well combined.
Reduce the heat to low then add in the green beans. Stir and cook for 5 minutes then add pepper to taste.