01 - Lay out the 4 bread slices on a clean cutting board or flat surface.
02 - Spread mayonnaise evenly on one side of each bread slice using a butter knife or spreader.
03 - Arrange the thinly sliced tomatoes on two of the bread slices, slightly overlapping each piece for even coverage.
04 - Sprinkle the kosher salt and freshly ground black pepper evenly over the tomato layers.
05 - Tear and scatter the fresh basil leaves over the seasoned tomatoes, if using, for an aromatic finish.
06 - Place the remaining bread slices on top, mayonnaise side facing down, and gently press to set the layers.
07 - Cut each sandwich in half diagonally or straight down the middle, then serve immediately for optimal texture and freshness.