Grilled tuna with parsley salad

Name: Grilled tuna with parsley salad
Prep time: 15 min
Cook time: 2 min
Total time: 17 min
Cuisine: British
Ingredients: 2 line-caught yellowfin tuna steaks , about 140g/5oz each; 1 tbsp olive oil; 2 lemons wedges; 2 handfuls (50g/2oz) flat-leaf parsley , very roughly chopped; 2 shallots , finely sliced; 1 tbsp capers , roughly chopped; small handful green olives , stoned and roughly chopped; 6 tbsp olive oil; 1 tbsp Dijon mustard; juice of half a lemon