Wash the leg slice and boil it in 1 1/4 litre salted water. Skim off the foam. Cook at low heat for about 1 1/4 hours. Clean and wash the soup greens. Chop half coarsely and add to the meat.
Cut the remaining carrots and celery into fine cubes, leek into fine strips. Peel garlic and cut into very fine slices. Pour stock through a sieve. Let the meat cool down a little. Heat 20 g fat in a pot.
Sauté garlic and diced soup vegetables in it. Add stock, bring to the boil and cook for 5 minutes. Remove flesh from skin, fat and bones, cut into small cubes and add to the soup.
Season to taste with salt and pepper. Cut bread into small pieces. Heat the remaining fat in a pan and roast the bread in it until golden brown. Serve garlic soup with the bread.