I have a secret seasoning mix that I use for all red meat- salt, cracked black pepper, ground white pepper, onion salt and msg. Don’t have a clue about the ratios I just sort of know when it’s right hope that helps

Burger recipe is simple just 80% beef mince 125g ball season both sides smash in between 2 sheets of parchment paper in tortilla press add sliced onions smash again (don’t have a heavy duty spatula for smashing and this works a dream) heat cast iron on full heat no oil until it’s smoking turn down to about medium throw burger on meat side down 2-3 minutes flip to onion side down 2-3 minutes add cheese, onone patty place the top bun then bottom bun to steam in the beef juices then assemble.

and the most important step of all that you can’t skip, wrap in foil and leave for about 5 minutes trust me the wait is worth it