Mediterranean Salad with Tuna - A better choice!

Ingredients

• 8 baby potatoes, boiled in the skins, then peeled
• 150g green beans, steamed
• 1 red capsicum, cut into bite-size pieces
• 2 medium tomatoes, quartered or cherry tomatoes, halved
• 2 cups rocket or other green leaves, washed
• 2 hard-boiled eggs, quartered
• 16 black olives
• 4 anchovy fillets
• 1 small red spanish onion, finely sliced into rings
• 1 tsp Dijon mustard
• Juice of 1 lemon
• Freshly ground black pepper
• 1 1/2 tbsp extra virgin olive oil
• 4 tbsp finely cut chives
• 400g canned tuna in oil or brine, drained