Step 1: Gather all the necessary ingredients for Salad Nicoise. This includes tuna, green beans, potatoes, tomatoes, olives, capers, hard-boiled eggs, lettuce, and the vinaigrette ingredients (olive oil, Dijon mustard, red wine vinegar, herbs).
Step 2: Boil or steam the potatoes until they are tender. Drain and set aside. In a separate pot, blanch the green beans in boiling water for a few minutes until they are crisp-tender. Transfer the green beans to a bowl of ice water to stop the cooking process and preserve their vibrant color.
Step 3: In a small bowl, whisk together olive oil, Dijon mustard, red wine vinegar, and herbs (such as thyme, oregano, or basil) to make the vinaigrette. Season with salt and pepper to taste.
Step 4: Arrange a bed of lettuce leaves on a large platter or individual plates. Arrange the cooked potatoes, green beans, tomatoes, olives, capers, and hard-boiled eggs on top of the lettuce.
Step 5: If using canned tuna, drain it and flake it into chunks. If using fresh tuna, sear or grill it to your desired level of doneness. Place the tuna on the salad.
Step 6: Drizzle the prepared vinaigrette over the salad. Use as much or as little as you prefer, depending on your taste.
Step 7: Gently toss the salad to coat all the ingredients with the vinaigrette. Serve immediately and enjoy the vibrant flavors of Salad Nicoise.
Note: Making Salad Nicoise at home allows you to customize the ingredients and flavors to your liking. Don't be afraid to experiment and add your own twist to this classic recipe.