You won't believe that you can make Kewpie Mayo at home (recipe by @chefclaricelam ) Kewpie is a Japanese brand of mayo. The main difference between Kewpie and American mayo is that Kewpie uses only egg yolks, while American mayo uses whole eggs. Another difference is that Kewpie mayo uses rice or apple cider vinegar rather than white distilled vinegar. This yields a richer and creamier product that tastes like egg salad in custard form, much rounder and fattier on the palate with a silky smooth finish.