*Optional* Toast bread.
Lightly coat both slices of bread (one side) with vegan mayo.
Arrange the avocado slices on one slice of bread, mayo side up.
*Optional* Heat the tempeh strips in a nonstick skillet over medium heat until hot and lightly crispy on both sides. If using Smart Bacon, lightly fry in olive oil until crispy. I do not recommend using cold Smart Bacon.
Slice the tempeh strips in half (to shorten), then cover the avocado with the strips, overlapping the tempeh if necessary.
Top the tempeh with the tomato slices, then season with salt and pepper to taste.
Cover the seasoned tomatoes with lettuce, then complete your sandwich with the top slice of bread, mayo side down, of course.