Wash the potatoes and cook in boiling water for about 20 minutes. Drain, rinse and peel. Peel shallots and cut into fine slices. Finely dice bacon and leave it crispy in a pan without fat. Remove bacon. Add shallots, vinegar, 4 tbsp. water, mustard and honey, bring to the boil once.
Cut potatoes and cucumbers into slices and put them into a bowl. Pour marinade over them, mix. Season with salt and pepper. Leave to stand for at least 30 minutes. Clean and wash the radicchio, cut into strips and fold into the potato salad. Arrange on plates with trout fillets
waiting time 30 minutes