To toast the nori, lightly lay each sheet, first on one side then flipping it over to the other,
on a cast iron skillet over high heat.
You could also make
this on a cast iron skillet.
I live in central Texas, used a good quality flour (not the cheapest but not the most expensive either), and cooked
them on a cast iron skillet.
I knew I wanted to pull the beef off at 115 degrees knowing I was going to finish it off
on the cast iron skillet.
On a cast iron skillet, over medium hight heat, add the oil and onions until translucent.