How to Make It
Combine 2 tablespoons oil, vinegar, and next 4 ingredients (through pepper) in a medium bowl, stirring with a whisk. Add tomato, artichokes, and olives; toss to coat. Let stand 5 minutes.
Cut ciabatta in half horizontally; remove insides of bread, leaving a 1/2-inch-thick shell. Spoon tomato mixture over bottom half, leaving some juices in bowl. Top with fennel, egg, and basil. Stir remaining 2 teaspoons oil into reserved juices; brush mixture over cut side of top half of bread. Place top half of bread on top of sandwich. Wrap sandwich tightly in foil; press gently. Unwrap; cut into 4 pieces using a serrated knife.
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