In a small bowl, mix together the mayo, chopped basil, lemon juice, salt and pepper. Set aside.
On the stovetop or in the microwave, cook bacon until crispy. Remove to a paper towel to drain.
Toast the bread until just crunchy on the outside and a bit browned.
To assemble the sandwich, slather the basil mayo on one slice of bread, top with the peaches,then the lettuce, then the bacon. Top with the other slice of bread and take a bite!