Peel and quarter the celery and kohlrabi. Clean and wash the leek. Peel the onions and garlic cloves. Wash the parsley and shake dry. Pour water (5 liters) into a large saucepan, add salt (2 teaspoons) and heat. Wash the meat, pat dry with kitchen paper and slide into the hot water. Add the vegetables (celery, leek, kohlrabi, onions, garlic cloves and parsley) and let everything simmer / cook for about 3 hours. Place folded parchment paper under the lid. Take out the meat, let it rest and cut into slices with a sharp knife (here: with an electric knife)