Beef mince with a high fat content, at least 20%. Smash onto hot cast iron, you want it thin. Salt & pepper. No more squashing, allow side one to caramelize, flip once. NO MORE SQUASHING. Add fake wax cheese, real cheese just turns to a greasy mess on burgers. Serve on brioche bun. Onion, tomato, lettuce, dill pickle, ketchup, mustard, mayo. Or a good “burger sauce” in place of the ketchup, mustard, mayo
I look forward to the faff and elaboration you can bring to this topic in pursuit of perfection, preferably a process that will take the best part of a week and requires precision lab equipment.