Combine all ingredients except basil in a medium bowl.
Lay the basil leaves on top of one another and put them down on a cutting board. Then, working your way from the top down roll the leaves up tightly. Using a sharp knife, begin to cut thin strips off of the roll.
Add the basil strips to the tomato mixture and stir to combine. Allow to marinate for at least 30 minutes before serving.
Credit: Elizabeth Blessing, GreenBEAN Delivery