Pour liquid over onions. Pickled Maui Onions Recipe. Let stand for 24 hours. Put into glass jars and set aside. vinegar, sugar, anhd salt, and stir until Refrigerate for 2-3 days. Tangy, mustard style BBQ sauce on the chicken was great with the pickled onions for crunch. Cook macaroni and cool. Hawaiian chili pepper, finely chopped, or dried red pepper flakes Add water to a pasta pot with a little Hawaiian salt and bring to a full rolling boil.