For the salad Wash all potatoes. Cook the sweet potatoes for 10-15 minutes depending on their size and the other potatoes for about 20 minutes. Quench, peel and let cool down.
Clean, wash and finely chop the spring onions. Peel and finely chop the onions. Fry them in 2 tablespoons of hot oil until transparent. 1⁄4 Add l water and stock, bring to the boil. Stir in 4 tbsp vinegar. Season.
Cut the potatoes into slices. Mix with spring onions and hot marinade. Leave to stand for at least 2 hours.
For the shrimps, defrost frozen shrimps. Clean the chilli, cut lengthwise, remove seeds, wash and chop. Wash the shrimps and dab dry. Fry in 3 tbsp. hot oil in 2-3 portions all around for approx. 2 minutes.
Add the chilli and fry briefly. Salt the prawns and let them cool down.
For the salad, fry the bacon in a large pan until crispy and drain on kitchen paper. Wash the apple, quarter it, remove the seeds and grate finely. Mix with 6 tbsp vinegar, salt and pepper. Fold in 6 tbsp. oil.
Crumble and add the bacon. Mix the marinade with the potato salad. Season to taste again. Arrange prawns on top.