1. Combine first 7 ingredients in a medium bowl. Combine basil and oil; stir with a whisk. Cut bread in half horizontally. Hollow out top and bottom halves of bread, leaving a 1-inch-thick shell; reserve torn bread for another use. Rub cut sides of garlic clove over cut sides of bread; discard garlic. Drizzle basil mixture evenly over cut sides of bread. Spoon tuna mixture on bottom half of baguette. Arrange tomato slices over tuna mixture. Cover with top half of baguette. Wrap filled baguette in plastic wrap, and let stand for 20 minutes. Cut filled baguette into 4 (3-inch) equal portions.
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