Tuna Nicoise Salad

• 300 g potatoes, peeled and cut into quarters
• 200 g green beans, ends removed
• 2 free range eggs
• 1 baby cos lettuce
• 1 tomato, cut into wedges
• .25 cup kalamata olives, pitted
• 200 g tuna, in olive oil
• 2 tsp dijon mustard
• 2 tbsp red wine vinegar
• 2 tbsp extra virgin olive oil