With all the awesome post @ the Off-topic: Food (on topic if pairing with music ;) )
I can start with a family traditional:
XL ziplock bag
Beer (Modelo Especial)
Skin some fat out of your fajitas (if you didnt tell the butcher (El Carnicero) to do it for you…)
Note: Dont skin too much fat out as is important for fajitas to have “some fat”
One day before, season the fajita with beer, Salt to liking, and pepper to liking.
Put in the ziplock bag and wait to the next day.
Pre heat BBQ pit to 200F, slap the fajitas in and dont let your grill pass 300F.
Cook to choice of liking, Ours is medium almost medium rare (About 10/25Min in give or take on each side).