Wash the potatoes and boil them for about 25 minutes until soft. Roast pumpkin seeds in a pan without fat, take out. Cut bacon slices in half and let them crisp in a pan, drain on kitchen paper. Peel onion and chop finely. Simmer mustard, oil, diced onion, broth and vinegar for 1-2 minutes. Drain the potatoes, peel them, possibly cut them in half and put them into a bowl. Pour hot broth over the potatoes and let them steep for about 2 hours.
Stir from time to time. Peel and chop the cucumber. Wash and halve the tomatoes. Wash and clean spring onions and cut into rings. Wash marjoram, shake dry and chop the leaves roughly. Chop the bacon coarsely. Mix cucumber, spring onions, tomatoes, marjoram, bacon, pumpkin seeds and potatoes and season to taste with salt and pepper
2 hours waiting time