Mayonnaise is known all around the world; a thick, creamy sauce used to dress sandwiches, burgers, and salads. But few nations have taken it to their hearts in the same way as the Belgians.

The relationship between Belgians and their mayonnaise is tied up in their fanatical "frituur" culture and in a law which has made Belgian mayonnaise special.

But in the face of complex commercial challenges and a generational change in eating habits, can the Belgians preserve their extraordinary mayonnaise heritage?