• 1 small leek
• 1 celery stalk
• 1 carrot
• 1 onion
• 2 meaty pork knuckles
• Salt
• Black pepper corns
• 2 tablespoons cooking fat or vegetable shortening
• a pinch of cumin
• Beer or water

1. Wash and dice the leek, celery, carrot and onion. Cook pork knuckles, diced vegetables, salt and peppercorns in water to cover 2 to 3 hours or until tender. Avoid overcooking. (Should not be falling off the bone) Remove from water; drain well reserving vegetables and cooking liquid. Preheat oven to 425F (220C). Melt fat or shortening in an enamel-lined, cast iron pan. Add drained pork knuckles, cooked vegetables and a small amount of cooking liquid.
2. Bake 30 minutes. Moisten meat frequently with more cooking liquid. Before meat is fully cooked, sprinkle with beer or water in which a good amount of salt has been dissolved. Add cumin to increase flavor. Serve with potato or white bread dumplings or sauerkraut salad. Note: In Bavaria, the juices and cooking liquid are strained and served as an accompanying sauce.

I think I got this recipe from Twinkle on the former German Corner on the TOH BB. I had pig's knuckle while in Munich and loved it.