Place your lamb neck pieces into the large pot. Cover the meat completely with cold water. Bring the water to a boil very quickly. This helps clean the meat before the real cooking.
Drain the hot water and rinse the lamb well. Put the cleaned meat back into the pot. Add two liters of fresh cold water now. This will be your rich soup base.
Turn the stove to a medium-high heat. Bring the pot back to a rolling boil. Use your skimmer spoon to remove gray foam. This keeps the liquid clear and nice.
Add the pearl barley and split peas now. Stir them into the water with your spoon. Lower the heat to a gentle simmer. Cover the pot with the lid tightly.
Let the meat and grains cook for one hour. The grains will start to get very soft. The kitchen will start to smell wonderful now. Keep the heat low and steady.
Add the diced carrots, swede, and celery. Stir in the sliced leeks at this time. Season with plenty of salt and pepper. These are key ingredients for Hairy Bikers Scotch Broth Recipe.
Cook the soup for one more hour slowly. The meat should be falling off the bone. Remove the bones from the pot very carefully. Chop the meat and return it.
Stir in the chopped fresh parsley at the end. Taste the soup to see if it needs salt. Serve the broth hot in large soup bowls. Enjoy your homemade Scottish meal.