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