I recently moved from Poland to Canada and was shocked to find that I found every mayonnaise I tried in Canada tasteless.
So I compared the ingredients labels of the ones I tried here to the ones I knew from Poland, and the biggest difference I found consistently between mayonnaise in Canada and Poland is mustard, which is not present in any major brand's mayo in Canada, and it's there in every single one that I know from Poland - so I assume this must be the crucial difference.
Then I found out that Hellmann's (one of the most popular brands in Canada, less popular in Poland but still a big brand) version in Poland ("Hellmann's Babuni") also contains mustard - this led me to believe that it is definitely not a coincidence.
So, what I'd like to find out, is which regions prefer mustard in mayonnaise and which ones don't.
For example, is it a difference between entire Europe and North America, or just some regions? What about other parts of the world? I know mustard is not the only difference, but let's limit the question to this aspect.