Aussie potato salad

Name: Aussie potato salad
Prep time: 15 min
Cook time: 1 h 30 min
Total time: 1 h 45 min
Ingredients: 500 g water; 4 eggs; 1000 g potatoes (e.g. Ruby Lou), peeled and cut into pieces (2 cm); 150 g bacon, cut into pieces (1-2 cm); 3 spring onions/shallots, trimmed and finely sliced (reserve green fronds for garnishing); 1 tbsp olive oil; 60 g Parmesan cheese, crust removed and cut into cubes (3 cm), plus extra shaved for garnishing; 200 g mayonnaise (see Tips); 15 g wholegrain mustard; 10 g balsamic vinegar