Potato and avocado salad with wasabi

Ingredients

• 1 kg potatoes, cut into circular slices or cubes
• 4 tbsp Kikkoman Naturally Brewed Organic Soy Sauce
• 1 tsp wasabi paste
• 125 ml mayonnaise
• 1 tbsp lemon juice
• 1 tsp mustard (e.g. Dijon mustard)
• 1 pinch of salt and sugar
• 2 avocados with the shell and stone removed and diced
• 5 hard-boiled eggs, chopped
• 125 g blanched celery, chopped
• 125 g spring onions, chopped