Cook the lentils in 1/2 litre of boiling broth for about 45 minutes. Peel, wash and slice potatoes and carrots. Peel garlic and ginger, dice very finely. Peel shallots. Heat oil. Fry shallots for about 4 minutes, turning them, add garlic and ginger and sweat them. Add potatoes, sauté and deglaze with remaining stock.
Cover and cook for about 20 minutes. Add carrots after about 10 minutes and cook. Pluck rosemary needles from the stalks. Drain vegetables and lentils and season with salt, pepper, rosemary and vinegar. Clean, wash and drain the lamb's lettuce. Line a plate with lamb's lettuce and arrange the potato salad on top
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