Fans of Nutella are facing a worldwide shortage after a strike at the biggest factory that makes the spread.
French workers have brought the Nutella factory to a near-standstill in a showdown over salary negotiations.
The plant in Normandy produces 600,000 jars of the chocolate and hazelnut spread every day - a quarter of the world's production of the product.
It comes after mounting tensions from the Workers' Force union - who have been barring trucks from entering or leaving the factory for a week.
Nutella owner Ferrero has started threatening fines for workers involved in the blockade, according to a company statement.
But so far unions have not been deterred, with around 160 of the factory's 350 works taking part in a walkout demanding better pay and conditions.
Union activist Fabien Lacabanne said: "It's war, anger is mounting".
He said the company agreed to a 1.7% raise for the lowest paid workers, and one-time bonuses between zero and 400 euro, which unions say is not enough given rising living costs. Unions also complain of deteriorating factory conditions and increasing pressure to be more productive.
Italian-owned Ferrero said it is trying to protect workers who are not on strike, and wants to resume dialogue - but not until the workers stop blocking the factory.
The next negotiation meeting is scheduled for June 13.
French workers frequently go on strike during salary negotiations and occasionally resort to more dramatic methods. The last strike to hit the Normandy factory was in 2011.
The action comes amid anger among many low-income French workers at pro-business policies by President Emmanuel Macron seen as favouring the rich - and that prompted the yellow vest protest movement.
