It's a cover for a cheese plate. See the post below for further details, "please help identify" posted by TS.
BTW, this is a non-binaries newsgroup....that means you do NOT post pictures in here! You may post links to pictures, but no binaries. That's so that actually valuable text posts (well....some are valuable, some are useless banter) are not pushed off the server to make way for your photos. Thanks for being considerate in the future.
CheeseDog