Country Potato Salad

• 3 eggs (hard cooked)
• 1 watercress (fresh garnish)
• 1 parsley sprigs (garnish)
• 575 gr finn potatoes (yellow)
• 575 gr potatoes (new)
• 240 ml mayonnaise
• 100 gr celery (diced)
• 60 gr onions (diced red)
• 55 gr dill pickles (diced)
• 60 ml extra-virgin olive oil