In a large bowl, combine the shishito peppers with the olive oil, soy sauce, and a pinch of salt and pepper. Toss to coat.
Heat a grill or grill pan to medium-high heat. Place the peppers on the grill and cook for about 5 minutes, flipping occasionally, until the peppers are softened and charred in spots.
Meanwhile, in a small bowl, whisk together the mayonnaise, lemon juice, garlic powder, and a pinch of salt and pepper. Set aside.
Transfer the cooked peppers to a plate and serve with the soy aioli for dipping.
Interesting Facts
Shishito peppers are a mild variety of pepper, usually just slightly spicy.
These peppers are a popular Japanese dish and are often served at izakayas, Japanese pubs.
Soy aioli is a flavorful blend of mayonnaise and soy sauce.