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never heard of this

Me neither, but made me hungry. I would eat it.

Yeah, if you have a large group of guests, or you know some has allergies or maybe don't like shrimps, are vegetarians etc. it's pretty usual to make two or three smaller cakes. Like one with meat and cheese, one with shrimps and salmon and one vegetarian.

This is the silly one with everything at the same time. :)