Nicoise salad

Name: Nicoise salad
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: European, Mediterranean, French
Ingredients: 650g potato; 400g baby green beans, trimmed; 425g can tuna in oil, drained, flaked; 250g grape tomatoes, halved; 187.50 ml black olives; 2 baby cos lettuce hearts, leaves separated, washed; 4 hard-boiled Free Range Eggs, peeled, quartered; 3 anchovy fillets in oil, drained, halved lengthways (optional); 75.08 gm Classic Olive Oil; 82.50 ml red wine vinegar; 23.40 gm dijon mustard