Put in a heavy pan and add the stock.

Weigh down with a heavy pan and leave for 15 min.

Heat half the butter in a heavy pan and gently fry meat on all sides so it's cooked but pink in the middle.

In a large cast-iron or other heavy pan, heat remaining oil over medium-high.

Remove tray from oven, flip the circles over, then flatten with the base of a heavy pan.