Hake with shallot and parsley dressing

Ingredients

• 2 x 150g fillets of hake
• sea salt, black pepper & olive oil
• 2/3 shallots, sliced
• handful of flat parsley, finely chopped
• 1 tablespoon red wine vinegar
• 6/8 new potatoes, chopped
• 2/3 cloves garlic, sliced
• knob butter
• squeeze of lemon