Split the buns in half and lay them out. Plop a dollop of the gochujang mayonnaise onto the bottom halves and spread a little on the outside of the tops. Dip the tops into the peanut mixture, if using.☞ TESTER TIP: If you prefer a less messy experience, you can sprinkle the peanut-onion topping inside the bun instead of coating the outside.