Classic nicoise salad with a few extras

Ingredients

• 150 grams slim green beans, trimmed
• 1 teaspoon wholegrain mustard
• 1 lemon, finely grated zest
• 2 tablespoons lemon juice
• 2 cloves garlic
• 4 tablespoons extra virgin olive oil, plus extra for drizzling
• 1/4 teaspoon salt
• 1/3 cup parmesan cheese, grated
• 1 baguette, sliced thickly on the diagonal
• 1 cos lettuce, washed, dried and torn into bite-sized leaves
• 250 grams cherry tomatoes, halved
• 1/2 cup kalamata olives, pitted
• 20 basil leaves, shredded
• 4 eggs, hard-boiled, shelled and halved
• 200 grams canned tuna in oil