In a small bowl, combine sour cream, basil, cream cheese, and garlic. Stir until well mixed.Advertisement
Place sour cream mixture in a resealable plastic bag. Cut a small hole in one corner of the bag; seal bag. Pipe a small amount of the sour cream mixture onto the cut side of each tomato half. If desired, sprinkle with cracked black pepper.
Make-Ahead Tip: Prepare as directed in step 1. Cover and chill for up to 24 hours. Continue as directed in step 2.