How to Make It
Roast the bell pepper directly over a gas flame or under the broiler, turning, until charred all over, 5 minutes. Place the bell pepper in a small bowl and cover with plastic wrap; let steam for 15 minutes. Peel, seed and chop the pepper.
In a blender, combine the bell pepper with the ginger, garlic, yuzu kosho, lemongrass, yuzu juice and cilantro and pulse a few times. With the blender on, slowly add the 1 cup of canola oil, scraping down the side, until well blended. Transfer 1/4 cup of the marinade to a small bowl, cover and refrigerate.
Pour the remaining marinade into a bowl. Add the chicken and massage the marinade into the chicken. Cover and refrigerate for 3 hours.
Meanwhile, in a small bowl, combine the mayonnaise, miso and Sriracha. Season with salt and mix well.
Light a grill and brush the grates with oil. Remove the chicken from the marinade and season with salt. Grill over moderate heat, brushing with the reserved marinade and turning occasionally, until the skin is crispy and the chicken is cooked through, about 15 minutes. Transfer the chicken to a cutting board and let rest for 5 minutes. Slice the chicken and transfer to a platter. Garnish with the scallions and serve with the spicy mayo.
Yuzu kosho is a hot, spicy and aromatic Japanese condiment made from hot chiles and ultra-citrusy yuzu zest. Shiro miso is light yellow miso. Yuzu kosho and shiro miso are available at Asian markets and at amazon.com.