Prawn & cod cakes

Name: Prawn & cod cakes
Prep time: 30 min
Cook time: 25 min
Total time: 55 min
Cuisine: British
Ingredients: 250g cod loin, skinless and boneless; 175g cooked king prawns , chopped; 175g mashed potato; small bunch chives , snipped; zest 1 lemon , plus 1 lemon cut into wedges, to serve; 5 eggs , 1 beaten; 50g breadcrumbs; 2 tsp olive oil; 200g green beans; 100g cherry tomatoes; 1 tbsp white wine vinegar