01 - Lay out the 4 bread slices on a clean cutting board or work surface.
02 - Spread mayonnaise evenly on one side of each bread slice using a butter knife or spreader.
03 - Arrange thinly sliced tomatoes on two of the bread slices, overlapping slightly for even coverage.
04 - Sprinkle the tomato layers with kosher salt and freshly ground black pepper to taste.
05 - Top the seasoned tomatoes with fresh basil leaves for added flavor and freshness, if desired.
06 - Place the remaining bread slices on top, mayonnaise side down, and gently press together.
07 - Cut each sandwich in half diagonally or straight down the middle. Serve immediately for the best texture and flavor.