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This sandwich gets better and better the longer it sits (okay, to a point); assemble it after breakfast and eat it when you’ve worked up an appetite.
INGREDIENTS
Fennel and Olives
Assembly
RECIPE PREPARATION
Fennel and Olives
Toss fennel, olives, oil, vinegar, capers, and red pepper flakes in an airtight container or resealable plastic bag; season with salt and pepper.
Do Ahead: Fennel-olive mixture can be made 2 days ahead. Cover and chill.
Assembly
Toss fennel-olive mixture with cucumber and tuna in a medium bowl; season with salt and pepper. Let sit, tossing occasionally, 10 minutes.
Scoop out inside from top half of bread; discard (or save for a snack!). Layer bottom half of bread with tuna mixture, then top with eggs and arugula. Close up sandwich.
Place a large heavy skillet or pot on top of sandwich to weigh down and let sit at room temperature, turning once, until evenly pressed, about 2 hours (if making sandwich at home, or storing in a cooler while you hike, wrap it up tightly in plastic wrap before you press it).
Slice pan bagnat into wedges just before serving.