I have a Eurostar ticket booked through Deutsche Bahn. It is a first class ticket, so it [should correspond](https://travel.stackexchange.com/q/118402/2509) to one of the classes that includes meals. To pre-order vegetarian meals, [Eurostar advices](https://www.eurostar.com/uk-en/travel-info/your-trip/food-on-board) to *request special meals in our Manage a booking section*. However, the *manage a booking* section on the Eurostar website is not available for tickets booked through Deutsche Bahn. How can I still request a special meal?