Nicoise Salad with Tuna

Ingredients

• For the salad:
• 2 potatoes, cut into small cubes
• ½ cup green beans, blanched and halved
• ¼ cup black olives
• 10 cherry tomatoes, halved or quartered
• ½ head butter lettuce, washed and roughly chopped
• 4 anchovy fillets (optional)
• 1 can tuna in water, drained and flaked
• For the dressing:
• 3 tablespoons extra-virgin olive oil
• 1 tablespoon freshly squeezed lemon juice
• 1 teaspoon dijon mustard