McDonald's wants to increase its sales and is fine-tuning the recipe for its important classics – but not everyone likes a current change. In Germany, the recipe of a sauce for a popular burger has recently been changed – and it doesn't go down well with everyone.

The fast-food chain introduced the "McPlant" in February, a vegan burger as an alternative for vegans. It remains to be seen whether the announced changes to the Big Mac and Cheeseburger will trigger similar reactions from customers.