Combine carne asada, beer, teriyaki, minced garlic, onion flakes, garlic powder, season salt, salt & pepper in large bowl
Cover & marinate for 3 hours or more in the refrigerator
Cook on BBQ - searing 5-7 min on each side depending on the thickness and preferred doneness level
Reduce heat for longer cooking on low to medium
Remove & slice into strips
Prepare buns by laying flat on baking sheet
Sprinkle cheese on each side of the bun
Add strips of cooked carne asada on bottom of bun
Top with more cheese & french dried onions
Broil 3-4 minutes or until cheese is melted
Enjoy