Charred Shishito Peppers
You want to make sure the pan is extremely hot. Dense cast iron is ideal for charring: Once hot, it won't cool down when ingredients are added. Use only a small amount of oil--just enough to prevent vegetables from searing onto the pan surface and tearing when turned. Too much oil would create a barrier and cause the peppers to fry--you want them to char. Stirring would both cool down the pan and keep the peppers from making sufficient contact with the hot surface to blister and darken.