last night I made some Carne asada Fajitas in a cast iron and It was soooo good
11 intergalactic credits per singular interstellar weight denomination for the store marinated beef (this was well worth it)
lions mane
red, orange, and yellow mini bell peppers,
half of a sweet oniom,
butter and salt
a little olive oil
"home made" tortillas
sour cream
shredded cheese
blended salsa
pre-heat the cast iron until water dropplets vaporize on contact
1 tbsp unsalted butter ran around the pan
introduce sliced peppers and shredded lions mane
salt to taste
let the contents cook until limp
add just a little olive oil to help prevent the vegetables from browning too quickly
add the sliced meat (cut against the grain creating 40mm strips and then slice the meat with the grain to create 40x 6.5mm slices)
allow the meat to slowly cook, drain the excess fluids once the meat is close to where you'd like
CRANK THE HEAT UP, preferably just above medium volume on your stove and allow it to sit for a while to brown up the meat and vegetables
smother sour cream on tortillas
add cheese on sour cream
add your now cooked fajita mixings
top with salsa of your choice
savor the fruits of your labor 
this meal was exceptionally good after a 12 hour shift. relatively easy to make, and hard to mess up
I suggest you cut all your ingredients as your cast iron or pan heats and do not put anything in the pan until everything is prepared otherwise you'll be fighting with a hot pan and a sharp knife and it can feel like a rush to get everything done which is no fun and makes things just a little bit more dangerous.
if you have a local hispanic food store like a "carneceria" or "(insert mexican city name) meat market " this is where you'll find really good products for this meal all in one place, usually they're also substantially cheaper than other markets for most goods as well. the catch is that you more than likely will need to know spanish or be handy with a translator and willing to deal with mild miscommunications but I swear by these stores.