I is a typical Czech open sandwich always nicely decorated and much better than normal sandwiches. Foreigners are often not sure whether to eat it with cutlery or not, they say it‘s kind of messy, but all agree that it is tasty.
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Just a reminder, I'm a Kiwi (New Zealander) and I have lived in Prague for 9 months with my wife who is Czech. It is very common to have these sandwiches when entertaining guests and are served when visiting friends and family at their homes.