Cook the bacon:
Heat a frying pan over medium heat and cook the bacon slices until crispy, about 3–4 minutes on each side. Remove from the pan and drain on a paper towel.

Prepare the rolls:
While the bacon is cooking, cut the rolls or buns in half. If you like, lightly toast the cut sides of the rolls in the pan or oven for a few minutes until golden.

Assemble the roll:
Spread mayonnaise and Dijon mustard (if using) on the inside of the rolls. Layer the cooked bacon on the bottom half of the rolls. Add fresh lettuce or arugula and a few slices of tomato if desired.

Serve:
Top with the other half of the roll and serve immediately while the bacon is warm and crispy.

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