Zak Pelaccio purees vibrant ingredients like fresh lemongrass and ginger with chiles and fish sauce. The sauce is delicious with any grilled or roasted fish, with or without the banana leaves.

Remove fish from skillet, and set aside. Place 1 banana leaf piece on a work surface, shiny side down. Spread a thin layer of masala (about 2 tablespoons) lengthwise down middle of each leaf ...