The hand grinder was a bit of work, but it was well worth the effort:
3lbs of fresh ground beef. Equal parts sirloin, brisket & oxtail - you can see the box for the grinder behind the cutting board:

The buns. Soft yet firm, and just the right size:

The cheese (this will be a mushroom & swiss burger):

The mushrooms, simmering in worcestershire sauce & red wine:

The mold:

The mold w/ a patty inside:

The patties, ready to go (I chilled them in the fridge for a bit before cooking):

A closer look at one of the buns - about to be toasted in the oven:

A patty in the cast iron skillet:

The finshed product, with it's accompaniment (My own IPA isn't ready yet...):

As I said - it was well worth the effort. Absolutely delicious.