Step 1:
In a tall cup using an immersion blender, combine mayonnaise, vinegar, lemon juice, mustard, capers, anchovies, and garlic; blend until smooth. Stir in basil and chives.
Step 2:
On a large cutting board, cut the baguette in half lengthwise. Spread half of the mayo mixture on both cut sides of the baguette.
Step 3:
Arrange toppings in the following order on the bottom half of the baguette: lettuce, tomato, artichokes, radishes, cucumber, tuna, eggs, onion, and olives.
Step 4:
Spoon the remaining mayo mixture over the toppings. Garnish with basil and pepper.
Step 5:
Cut the baguette crosswise into four equal sections and serve.
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