Actually that is not liquid cheese that a lot of those viral people use. This one pulls. Those viral ones slobber. Totally different.

Everything looks good in this video. The only thing i do not agree is the cream (milk solids) based seasoning he used when grilling the meat. It will cause the heat not get into the meat to cook it properly while the cream getting burnt outside. Seasoning like this HAS TO BE flowing liquid type (Example soy sauce). No other way around it. Unless he is asking for food poisoning case.

Also serving a steak burger (lamb in this case) with a bone in it is not a good idea. People can and will hurt themselves biting into it.

I thought he was using regular bread because it was square. Its was only proven not after he flipped the top bun.

If that guy is reading this, this are the improvements to do.