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I have one of these as well and I love it. The idea is you place this thing on top of your grill and let it get really hot. Then you put your burgers/steak on top of one of the logos, push the meat down to sear the logo into your meat. The end result is a burger with Goldy or the block M on it.
I have no affiliation with this particular website or company, just a cool product that I have used and love.