Step 1: Preheat the oven to 400°F.
Step 2: Using a fork, flake the tuna into a bowl. Stir in the mayonnaise, celery, onion, cucumber, and lemon juice and mix well. Season with salt and pepper to taste and mix again.
Step 3: Cut the baguettes in half lengthwise and divide the tuna mixture between the bottom pieces.
Step 4: Place 2 slices tomato on each sandwich, if desired. Top with a cheese slice and the baguette lids, pressing down gently to settle the filling.
Step 5: Place the sandwiches on a baking sheet and bake for 5 to 7 minutes, until the sandwich is warmed through and the cheese begins to melt. Alternatively, you can warm the sandwich in a griddle or sandwich maker.
Step 6: Serve the sandwiches immediately
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