Bring the lentils and 1/8 litre of cold water to the boil, cover and simmer over a low heat for about 15 minutes. In the last 2-3 minutes add 1/2 teaspoon salt
Clean lamb's lettuce, wash thoroughly several times and drain well. Clean, wash and drain the chicory and cut into strips. Dice beetroot
Pour the lentils onto a sieve and let them drip off. Peel and finely dice the shallot. Mix vinegar, approx. 1 tbsp. cold water, diced shallots, mustard, some salt, pepper and sugar. Finally, fold in the oil. Mix the lentils with the vinaigrette
Cut the trout filets into pieces. Mix lamb's lettuce, chicory and beetroot and arrange on a large plate with the trout fillets. Spread lentil vinaigrette over it