1. Cut the pork shoulder into cubes of about 5-6 centimeters on each side.
2. Brown them in a casserole dish with a little fat.
3. Remove the meat from the casserole, add more fat, and brown the sliced onions.
4. Put the meat back with the onions, add the flour and mix well. Pour in the bottle of cider.
5. Let it cook over low heat for about an hour. Season with salt and pepper.
6. If the sauce seems too liquid, you can thicken it by diluting 2 teaspoons of chicken stock.