Slice the baguette open, leaving one side attached to form a hinge. Cook the bacon in a skillet over low heat until crispy; drain on paper towels.
Combine the pesto with the mayonnaise and smear on the bottom part of the bread. Layer the romaine on the bread, then the tomato, bacon and mozzarella. Season with salt and pepper; close the sandwich and wrap in parchment paper.
Photograph by Hallie Burton
Recipe courtesy Tyler Florence for Food Network Magazine