Bacon and spring onion potato salad

Salad

• 2 spring onions/shallots, trimmed and cut into thirds, plus extra cut into thin slices for garnishing
• 150 g bacon, cut into pieces (1-2 cm)
• 20 g olive oil
• 500 g water, plus extra for cooling
• 1000 g potatoes, peeled and cut into pieces (2 cm)
• 6 eggs

Dressing

• 200 g mayonnaise (see Tips)
• 20 g wholegrain mustard
• 2 tsp balsamic vinegar

Assembly

• 60 g Parmesan cheese, shaved, plus extra for garnishing
• 1 pinch ground black pepper