Heat olive oil in a cast-iron skillet over medium heat until hot, but not smoking. The pan is ready when water sizzles and evaporates on contact.
Add peppers and cook for about 10 minutes, stirring and flipping frequently- every 1-2 minutes, until blistered in spots, not charred.
Remove from heat and toss with soy sauce, fresh lime juice and sprinkle with salt
Serve immediately.
Notes
Here are a few pieces of advice to ensure your shishito peppers are the best:
Use cast iron. The most important tip is to use a seasoned cast-iron skillet. You'll find it’s so much easier to achieve the perfect tender-blistered texture with the right pan.
Don't overcrowd the skillet. Do not overcrowd the pan to ensure the peppers cook evenly and achieve a nice blistered skin. Cook them in batches if needed.
Serve ASAP. This dish is best enjoyed immediately after cooking to preserve the crisp-tender bite.