Defining menu with paid product modifiers
Let me explain what I would like to know using a very simple example:
We have a Fries and a ketchup. You can buy a Fries for 3€ or Fries with ketchup for 3.50€. You cannot buy a ketchup without fries.
What is the correct way to define it in the menu, so we know structure, prices and item relations are like above, simply after loading the menu using the API?