In a bowl, combine the beef, pork, mustard, egg (optional) Worcestershire sauce, miso, garlic powder and onion powder and mix together.
Take approximately ½-3/4 cup of meat and shape it until it is approximately 1cm thick. (Don’t worry, when the meat cooks it get thicker as it shrinks inwards). Make a small indent in the middle of each patty so that the burger keeps it shape and doesn’t curl up during the cooking process.
Use small pieces of parchment paper between the burgers to stack them up until you ready to cook them.
Let the patties sit for 30 minutes
In a cast iron pan, set the stove to medium heat and add a bit of oil. Wait until the pan is very hot.
Add in the burger and let it sear for 1-2 minutes. Don’t touch it or flip it!
Add ¼ cup of water to the pan and quickly put a lid over it and let it steam. (Careful, the steam is hot!) Let it cook for about 2 minutes, or until the water has evaporated away
Remove the lid and flip the burger and let it cook for another 2 minutes to brown the other side.
At this point, if you are adding cheese to your burger put it on now and put the lid over it for another 30 seconds or until the cheese has melted
Serve it on a bun and some toppings and enjoy!!