In a wok or cast iron skillet (do NOT use non-stick), heat the sesame oil over medium-high heat.
1 tsp toasted sesame oil
Add the peppers, and stir to toss in the sesame oil. Let the peppers sit and blister for a few minutes.
1 pound shishito peppers
Stir, and let sit again until they have reached your desired level of blistered. (3-5 minutes)
Add the soy sauce (or coconut aminos) and stir to coat.
1/4 tsp soy sayce
Transfer peppers to a bowl, and sprinkle with sesame seeds and a healthy pinch of kosher salt. Serve immediately.
pinch Kosher salt, sesame seeds
Air Fryer Instructions
In a medium bowl, toss peppers with sesame oil.
Add the peppers to the basket of air fryer.
Cook at 350 F for 7-10 minutes, shaking the basket midway. Cooking time will depend on the size of your peppers and how "done" you want them.
Add the peppers to a bowl and toss with the sesame oil and soy sauce. Sprinkle with a bit of kosher salt.
Notes
The key to getting an amazing blister without making the peppers soggy is to cook them fast and hot. You want a high temp and a very hot preheated wok/cast iron so they start cooking the second they hit the pan.