Mix together the mayonnaise, basil and ground pepper.
Spread the mayonnaise mixture evenly over five slices of the bread. Sprinkle each slice of bread with the chopped bacon. Arrange 4 slices of tomato on each piece of bread, making sure to cover the entire surface of the bread. Top with the remaining slices of the bread. Cut the crusts from the sandwiches and cut each sandwich into 3 rectangles. Cover well and refrigerate until needed.