01 - Toast the bread slices lightly until golden on the surface but still soft inside, if a crisp texture is desired.
02 - Spread a thin, even layer of mayonnaise over one side of each bread slice.
03 - Arrange the tomato slices in a single, even layer over two of the bread slices, overlapping slightly for full coverage.
04 - Sprinkle the tomatoes generously with salt and freshly ground black pepper to draw out their natural flavor.
05 - Tear or layer fresh basil leaves over the seasoned tomatoes.
06 - For added depth, drizzle the tomatoes with extra-virgin olive oil and balsamic vinegar.
07 - Place the remaining bread slices on top, mayonnaise side down. Slice each sandwich in half diagonally and serve immediately.