Soy tuna with wasabi mash - Good Food Middle East

Ingredients

• 3 tbsp soy sauce
• 1 tbsp rice wine vinegar
• 1 tbsp caster sugar
• 2 tuna steaks, each about 140g/5oz
• 500g potatoes
• 100ml semi-skimmed milk
• 2 tsp wasabi paste (see Know-how)
• 1 spring onion, finely sliced
• frozen broad bean or soya beans, to serve