Scrumptious thanks, Max! I will pop down to my local Lidl store in a day or so, and see if I can grab some! Another grocery item we used to love when stopping off at German autobahn service areas or nearby villages (én route to Hungary) was their continental breakfasts!
Gorgeous fresh bread rolls and coffee. But the butter was to die for! Last time I looked in Aldi and Lidl in UK (both German-owned) I was disappointed to find NO butter from Germany! How can that be, I wonder?
As regards mustard, have a look around in some of the shops catering for the Polish community. They have 2 or 3 varities ranging from Mild, to Medium to Hot, yummy!
Horseradish: Love it with just about anything! There's some lanes the other side of LTN airport where you can literally pick your own off the banks, then make it yourself! Some are are HOT, some are mild, just wait and see! Either way, it tastes gorgeous!
Cheers- AL

Gone but not forgotten...