1Thoroughly clean the webfoot octopus by rubbing it with coarse salt, rinsing under cold water, and removing any internal organs or eyes. Pat the webfoot octopus dry with paper towels.
2In a large mixing bowl, combine the Gochujang, Gochugaru, Soy sauce, Minced garlic, Minced ginger, Sesame oil, Granulated sugar, Mirin, and Black pepper powder to create the marinade.
3Add the cleaned webfoot octopus to the marinade, ensuring each piece is well coated. Let it marinate for at least 15 minutes at room temperature, or up to 30 minutes in the refrigerator.
