Mix all ingredients, except for the meat, in a large bowl and stir until the salt and sugar have dissolved.
Cut the meat into bite-sized pieces and add to the bowl for the marinade. Using clean hands or a spoon, mix the meat with the marinade until it is well coated.
Cover the bowl and let it rest in the refrigerator for 8-24 hours.
Rinse the meat very briefly before roasting to remove onion and garlic pieces. I usually only pour it briefly over a sieve to let the buttermilk run off, but fry the onion pieces with it.
Then fry the meat in a little oil over high heat. I use a pan that does not require oil due to its non-stick coating.
The meat is very tasty and a real all-rounder. Whether with a simple mixed salad or a baked potato with sour creame - it has always sparked enthusiasm up to now.