As The Wall Street Journal reports, some Belgian food producers are advocating that the nation loosen standards to create a more level playing field. But on the other side of the fight, chefs and consumer groups warn against messing with what is a royally-approved recipe. Supporters of the change say consumers want a healthier option, and that Belgian producers can better compete with European rivals if they embrace change.

Here in the U.S., a battle about how to define mayonnaise has also squeezed into the condiment aisle. Hellmann parent Unilever last fall sued a startup, alleging false advertisement because Just Mayo lacked eggs. Though Unilever later dropped the suit, the Food and Drug Administration recently stepped into the fray, contending Just Mayo maker Hampton Creek’s products were “misbranded” because they don’t meet the standard identity for mayonnaise.

The mayonnaise market is huge. In the U.S., it is actually the most popular condiment and generates roughly $2 billion in sales annually. And as Bloomberg notes, four of the top six best selling condiments are a mayonnaise.