Mediterranean Salmon and Spaghetti

4 x 100g salmon fillets, skinned and pin-boned

2 tbsp butter salt and pepper

200g wholewheat spaghetti

100ml olive oil

5 garlic cloves, crushed

12 cherry tomatoes, halved

2 tbsp capers, rinsed and roughly chopped

2 tbsp grated Parmesan

Handful basil leaves

2 handfuls rocket leaves