Boil hocks: Place the pork hocks, peeled and halved onions, peeled garlic cloves, cloves, bay leaves, peppercorns, juniper berries, caraway seeds in a large pot. Cover entirely with water. Bring to a boil. Add the salt, turn down the heat and simmer the pork hocks for 1 hour and 30 minutes, the water should only slowly simmer and not boil at any time.
Shortly before the time is up, preheat the oven to 200 degrees Celsius/ 400 degrees Fahrenheit.
Roast: Carefully transfer the knuckles to a roasting tin (Note 3). Pour ½ of the beer on top of the hocks and add about 1 cup hot broth to the tin. Sprinkle the hocks with salt. Roast for 30 minutes.
Flip: Turn the hocks on the other side and sprinkle them with salt. Add the rest of the beer to the roasting tin. Roast for another 30 minutes. The meat should be very tender.
Crisp: Turn on the broiler to crisp the skin. Broil the meat, turning the hocks on all sides, so that the skin can crisp all over. Keep an eye on the knuckles all the time, the crackling should not turn dark, but remain golden brown and get crispy. Serve immediately.