Make a slit in the top of each of the roll. Gently pull apart and create a cavity by removing about 1/2 of the bread inside. Save the bread to make breadcrumbs for meatloaf or Spice Crumb Pudding English Pudding. Set aside.
In a medium mixing bowl, add tuna, celery, onion, mayonnaise, and lemon juice stir to combine.
Fill the prepared rolls with 1/4 of the filling. Insert two toothpicks creating an “X” through the rolls to hold together.
Place on a baking sheet, brush the tops with melted butter and bake for 15 - 20 minutes until rolls deepen in color slightly.
Serve with a salad on a Friday night or any other weeknight. Or pack them and head to the beach for a picnic.