Poles have very strong convictions as to the "only proper" mayonnaise to go in our vegetable sałatka and there are two at the top of the list, both proud to be time-honoured and best, with one perhaps just that little bit ahead of the other. Now its maker has announced that they have seen such a hike in popularity outside the country, that they have needed to step up production... Agnieszka Bielawska and Elżbieta Krajewska debate.