When does mayonnaise stop being mayonnaise? The multinational firm, which manufactures Hellmann's and Best Foods mayonnaise, is suing a Californian business for selling a plant-based alternative called 'Just Mayo'. Unilever claims the name is misleading, and that Just Mayo, which is sold in major supermarkets, is eating into its mayonnaise sales. When the condiment contains no eggs then Uniliver claim they cannot call it mayonnaise feel they are falsely advertising and creating unfair competition.