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Heat oil in a pan, cook the sausages until browned, then remove. Tip in remaining oil, onion, garlic and pepper, then cook, about 5 mins more until softened. Add lentils and sausages to the pan with the stock and wine, if using.
Bring up to the boil, then simmer for 20 mins until lentils have softened and sausages are cooked through. Serve with plenty of crusty bread.