01 - Lay out the four 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, overlapping them slightly for even coverage.
04 - Sprinkle the tomato layers with kosher salt and freshly ground black pepper to taste.
05 - Place fresh basil leaves on top of the seasoned tomatoes for added flavor and freshness, if desired.
06 - Top each assembled half with the remaining bread slices, mayonnaise side facing down, and press gently.
07 - Cut each sandwich in half diagonally or straight down the center and serve immediately for the best texture.