1. To make the dressing, whisk the oil, lemon juice, vinegar, and mustard until combined.

2. Cook the pasta in a large pot of lightly salted water over high heat according to the package instructions until tender. Drain, rinse under cold running water, and drain well. Transfer to a large bowl and toss with a little olive oil.

3. Meanwhile, cook the beans in a saucepan of salted boiling water for 4–5 minutes, or until crisp-tender. Drain, rinse under cold water, and pat dry. Add to the pasta.

4. Preheat a ridged grill pan over high heat. Brush the tuna lightly with oil and season with salt and pepper. Place on the grill pan and cook, turning once, for about 4 minutes, until seared but rare inside.

5. Cut the tuna into bite-sized pieces and add to the pasta. Add the eggs, lettuce, tomatoes, anchovies, and olives. Just before serving, add the dressing and toss well. Season with salt and pepper. Serve at once.