Heat oil in a large covered skillet over medium high heat. Add onions and peppers, cook 2-3 minutes.
Mix in garlic and tomato paste, cook 1-2 minutes.
Add ground beef to skillet, break up with a spatula or wooden spoon. Cook until beef is just browned, 3-5 minutes. Stirring occasionally.
Stir in beer, Worcestershire sauce, vinegar, and barbecue sauce.
Cover and reduce heat to medium low.
Simmer 10-15 minutes until sauce thickens and beef is cooked.
Serve on slider sun or soft rolls with fresh jalapeno slices and crispy onions.