Boil the lamb's liver, heart, and lungs in a large pot of salted water for 1.5 hours. Once cooked, let them cool, then mince or finely chop them.
Toast the oatmeal in a dry pan until lightly fragrant.
In a large bowl, combine the minced offal, toasted oatmeal, chopped onions, beef suet, spices (salt, pepper, thyme, nutmeg), and enough water to create a moist and easily moldable mixture.
Spoon the mixture into the cleaned lamb's stomach, leaving room for expansion. Tightly tie off the opening of the stomach.
Place the filled stomach into a large pot of boiling water and simmer over low heat for 3 hours. Ensure the stomach doesn't burst during cooking.
Serve hot, traditionally with mashed potatoes (tatties) and mashed turnips or swede (neeps).
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