Add the flour, salt, and pepper as desired to a zip lock bag, and coat the liver with the flour. Set aside.
Add 2 tablespoons of the butter to a large non stick pan on medium heat. When hot, add the onion and apple slices. Cover and cook until tender and lightly browned. Remove from the pan, wipe clean and return to heat.
Heat the remaining 2 tablespoons of butter in the pan, when hot, add the flour coated livers.
When they are browned on both sides, return the onion and apples to the pan and sprinkle in the thyme. Reduce heat
Give it a stir, cover for 2-3 minutes, then add the apple juice. Stir to coat everything in the sauce. If the mixture is too pale for your liking, add a dash of soy sauce.
Cook for 2 more minutes to reduce the liquid a bit.
Serve with cooked noodles, spätzle, mashed potatoes, or rice. Enjoy.
Or better yet, serve with Hot German Potato Salad.