Carefully wash beetroot without damaging the skin and roots. Boil in boiling water for 30-40 minutes
Peel, wash and slice the potatoes. Peel garlic and chop finely. Wash rosemary, pluck needles from the twigs and chop coarsely. Mix potatoes with 3 tbsp. oil, rosemary, garlic, lemon juice and zest. Season vigorously with salt and pepper and spread on the fat pan of the oven. Pour on the stock and cook in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 45-50 minutes. Turn the potatoes occasionally
Peel and finely chop the onion. Mix vinegar, 2 tablespoons of water and mustard well. Season with salt, pepper and sugar. Add 3 tablespoons of oil drop by drop. Stir in diced onion
Drain the beetroot and rinse with cold water. Clean the beetroot, remove the skin. Cut beetroot into thin slices and mix well with the vinaigrette
Wash the meat, dab dry and season with salt and pepper. Heat 1-2 tablespoons of oil in a large, coated frying pan. Sauté the lamb salmon in it for about 4 minutes while turning. Fry over a low heat, turning over, for about 5 minutes. Wrap the finished salmon in aluminium foil and leave to rest for approx. 5 minutes
Cut the meat into slices. Season beetroot salad with salt and pepper and arrange on plates with potatoes and meat