This is my new toy for the kitchen, its a manual stuffed burger press that has a silicone piece in the middle that gives you a shallow hollow to put your filling of choice in (in this case it was a small amount of mozzarella and chilli flakes. This particular press can make just standard quarter pounder burgers or 3 mini burgers (great as meatballs).
Using fresh beef mince I filled both top and bottom sections then used the silicone insert to create the hollow and then pressed it back together. Without the greaseproof circles that you can buy it was quite fiddly to get the burger out of the press however with a single spray or spray oil in the top and bottom of the press before putting the mince in, made it a lot easier to remove.
I made 4 which with 4 bread rolls was a filling meal for 2, They were cooked for around 5 mins on a George foreman grill and stayed juicy without being greasy like a lot of shop bought burgers can be.